JP2011141867A - Data display device and server device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content display device that displays data at a high speed and is not an obstacle to a job of a foreground. <P>SOLUTION: While a power supply 120 of the content display device 11 does not supply an image display part 230 and an automatic execution state where the job of the foreground is kept, a web data acquisition part 171 reads ahead a data to be displayed and writes the data in a data storage part 190. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a data display device and a server device.

  When a data display device which is a client device on a communication network (Network) acquires display data from a display data server (Data Server) device and displays it, the display data server device to the data display device If the communication speed is slow, it may take time to display depending on the amount of data. For example, a personal computer (PC) operated by a user uses a line with a low communication speed such as ADSL (Asymmetric Digital Subscriber Line) having a downlink of about 3 megabits per second (Mbps). When accessing a web server device on the Internet and displaying a web page specified by the user, the web page specified by the user is an elaborately designed web page. For example, when the display data is large, it takes time to acquire the display data, and as a result, it takes time to display the web page, which may cause stress on the user.

  In such a case, as one method for shortening the time required for displaying a web page or the like, display data such as a web page or the like that is likely to be displayed in the future is displayed on a web page or the like designated by the user. There is a so-called prefetching method that is acquired in advance in the background of processing. By pre-fetching display data that is associated with display data such as a web page specified by the user in advance, the time required for display is shortened even for a web page that is displayed for the first time. be able to. For example, the page browsing apparatus of Patent Document 1 acquires in advance a page on which a hyperlink (Hyperlink; reference information that links a plurality of documents in a hypertext system) included in a display target page is provided.

In addition, the information communication system disclosed in Patent Document 2 shows a configuration in which a data collection device that performs prefetching is provided separately from a client device that receives a user operation. In this information communication system, the data collection device collects in advance data that is likely to be requested by the client device in the future and stores it in the data storage device. The client device requests data from the communication relay device and receives data from the communication relay device.
When data is requested from the client device, the communication relay device reads and outputs the desired data from the data storage device if the requested data is stored in the data storage device, and if the data is not stored The desired data is read from the data server device on the network and output.
In the information communication system of Patent Document 2, even if the communication speed from the data server device to the communication relay device is low, the client device can acquire data at a higher communication speed.

JP 2009-3899 A JP 2002-116971 A

However, like the page browsing apparatus of patent document 1, performing foreground reading in the background may interfere with foreground processing. “Foreground processing” here is processing that involves output to the user, such as image display or audio output. On the other hand, “background processing” is processing that does not involve output to the user. For example, the processing result or the data acquired from the outside is not output to the user and written to the storage unit. To do.
For example, in the background of processing to display on the browser while acquiring the display data of the web page instructed by the user from the web server device, the display data of the web page in which the hyperlink is attached to the displayed web page In order to obtain display data to be performed in the background, hardware resources and communication that can be used to obtain display data for the web page instructed by the user by using hardware resources such as a communication band. The speed is reduced, which slows down the display speed of the web page and may stress the user.
Further, in the method of Patent Document 2, when the communication relay device is not provided, or when the communication speed from the communication relay device to the client device is low even if there is a communication relay device, the time required for the data display described above is required. Can not be shortened.

  The present invention has been made in view of such circumstances, and a purpose thereof is to display a data based on display data at a higher speed and to prevent a foreground job from being hindered. Another object of the present invention is to provide a server device that provides information for displaying an image based on display data at a higher speed.

[1] The present invention has been made to solve the above-described problems, and a data display device according to an aspect of the present invention includes an image display unit that displays an image, and a display that displays an image displayed by the image display unit. Display data storage unit for storing data, a state management unit, and storage location information indicating a storage location of display data on the network, and display data is acquired based on the acquired storage location information A display data acquisition unit that writes the acquired display data to the display data storage unit in association with the storage position information, and when the predetermined event occurs, the state management unit If the state after the state transition is determined based on the occurrence of the event and it is determined that the state is a predetermined state, the display data acquisition unit determines the storage position of the display data on the network. The storage position information is acquired, display data is acquired based on the acquired storage position information, and the acquired display data is associated with the storage position information and written to the display data storage unit It is characterized by that.
Since this data display device determines the status and acquires display data, it does not interfere with the foreground job by acquiring the display data when it is determined that the job is not executed in the foreground. . Since the acquired data is written into the display data storage unit, the data can be displayed at a higher speed when displaying an image based on the display data.

[2] A data display device according to an aspect of the present invention includes an image display unit that displays an image, a display data storage unit that stores display data indicating an image displayed by the image display unit, and A power supply unit that supplies power; a state management unit that controls whether the power supply unit supplies power to the image display unit; and storage location information that indicates a storage location of display data on the network; A display data acquisition unit that acquires display data based on the acquired storage position information, writes the acquired display data in association with the storage position information in the display data storage unit, and the image display unit When storage position information is input while the state management unit is controlling the power supply unit to supply power, the storage position information and display data input by the display data storage unit If it is determined whether it is stored in association with each other, and if it is determined that it is stored, the display data stored in association with the input storage position information is read, and the display data read out A display data processing unit that causes the image display unit to display an image based on the state, and when the predetermined event occurs, the state management unit changes the state based on the occurrence of the event And when the power supply unit determines that power is not supplied to the image display unit, the display data acquisition unit acquires storage location information indicating a storage location of display data on the network. The display data is acquired based on the acquired storage position information, and the acquired display data is associated with the storage position information and written to the display data storage unit. It is characterized in.
In a state where the power supply unit does not supply power to the image display unit, nothing is displayed on the image display unit, so it can be expected that no foreground job has been executed. Since the data display device of the present invention acquires display data in this state and writes it in the display data storage unit, when displaying an image based on this display data, the data is displayed at a higher speed. And it won't interfere with foreground jobs. Further, since the data display device itself acquires display data, no communication relay device is required.

[3] A data display device according to an aspect of the present invention is the data display device described above, and the state management unit supplies power to the image display unit when a power-on instruction is input. And the display data acquisition unit controls to stop the acquisition of the display data when the display data acquisition unit is acquiring the display data.
Since the data display device stops obtaining the display data when a power-on instruction is input, the foreground job is not hindered by obtaining the display data.

[4] A data display device according to an aspect of the present invention is the above-described data display device, wherein the power source unit instructs the image display unit not to supply power to the predetermined event. An input of an off instruction is included.
It can be expected that the foreground job is not executed after the power-off instruction that instructs the power supply unit not to supply power to the image display unit is input. Since the data display device of the present invention acquires display data in this state and writes it in the display data storage unit, the data display device can display data at a higher speed and hinder the foreground job. Absent.

[5] A data display device according to an aspect of the present invention is the data display device described above, and further includes a storage position information storage unit that stores storage position information indicating a storage position of display data on the network. The display data acquisition unit acquires the storage position information from the storage position information storage unit.
The data display device can acquire storage position information from the storage position information storage unit, and can acquire display data based on the storage position information.

[6] A data display device according to an aspect of the present invention is the data display device described above, wherein the display data acquisition unit requests the server device connected to the network to transmit the storage location information. The storage position information is acquired.
The data display device can acquire storage position information from the server device, and can acquire display data based on the storage position information.

[7] A data display device according to an aspect of the present invention is the above-described data display device, wherein the display data acquisition unit is in a state where the power supply unit does not supply power to the image display unit. Information indicating this is notified to the server device, and transmission of the storage location information is requested.
The data display device notifies the server device of information indicating that the power supply unit is not supplying power to the image display unit, and requests transmission of the storage location information. The content of data transmitted to the data display device can be changed depending on whether the power supply unit of the apparatus is supplying power to the image display unit or not.

[8] A data display device according to an aspect of the present invention is the data display device described above, wherein the display data acquisition unit acquires a program including the storage location information from the server device, and acquires the program The display data is acquired by executing.
This data display device acquires display data by executing a program acquired from a server device. When means for analyzing and executing this program is incorporated in the data display device in advance, it is not necessary to separately provide means for analyzing the data acquired from the server device.

[9] Further, the data display device according to one aspect of the present invention is the above-described data display device, and the display data processing unit has storage location information of an RSS file that is a file indicating location information of display data. If it is determined that it has been input, the server apparatus is notified of the input storage location information.
Since this data display device notifies the storage location information of the RSS file to the server device, the server device reads the location information of the display data from the RSS file and transmits it to the data display device, whereby the display for the display indicated by the RSS file is displayed. Data can be acquired by a data display device.

[10] A server device according to an aspect of the present invention is a server device that transmits a list of storage location information of display data to a data display device or another server device, and the storage location information to be included in the list A display data acquisition unit for acquiring the display data indicated by the starting point storage position information based on starting point storage position information indicating display data serving as a starting point for searching the network, and the acquired display data A display data analysis unit that reads storage position information of display data associated with the display data, a list generation unit that generates the list including the read storage position information, and the data display device or the other When the list transmission request is received from the server apparatus, the data display apparatus or the other server apparatus that has transmitted the transmission request. In, featuring that includes a request processing unit for transmitting said list.
Since this server device generates and transmits a list of storage location information, the data display device that has received this list of storage location information can acquire display data in advance using this list. Thereby, when displaying the image based on the display data designated by the user, it can be expected to display at a faster speed.

[11] A server device according to an aspect of the present invention is the server device described above, further including a display data storage unit that stores display data, and the request processing unit includes: When the transmission request including information indicating that the data display device is in a predetermined state is received, the list is transmitted to the data display device, and the data display device is in a state different from the predetermined state. When the transmission request including the information indicating that is received, the display data is read from the display data storage unit, and the read display data is transmitted to the data display device that has transmitted the transmission request. It is characterized by that.
When the server apparatus receives a signal including information indicating that the data display apparatus is in a predetermined state, the server apparatus transmits a list of storage position information. When a signal including information indicating that the data display device is in a state other than a predetermined state is received, information different from the list of storage location information, such as web page display data, can be transmitted.

[12] A server device according to an aspect of the present invention is the server device described above, wherein the predetermined state is a state in which the power supply unit of the data display device does not supply power to the image display unit. It is characterized by.
Since this server device receives a signal including information indicating whether or not the power supply unit of the data display device supplies power to the image display unit, the data to be transmitted to the data display device is changed according to this information. be able to.

[13] A server device according to an aspect of the present invention is the server device described above, wherein the request processing unit generates a program that includes the list and acquires display data based on the list. The generated program is transmitted.
Since this server device generates a program for acquiring display data and transmits it to the data display device, the data display device can acquire the display data by executing this program.

[14] A server apparatus according to an aspect of the present invention is the above-described server apparatus, and further includes a storage position information storage unit that stores the starting storage position information for each of the data display device or each of the other server devices. And the display data acquisition unit acquires the display data based on the starting point storage position information stored in the storage position information storage unit.
The server device stores the starting point storage position information for each data display device or other server device, and acquires display data based on the starting point storage position information. Therefore, for each data display device or other server device, A list of storage location information can be generated.

[15] The server device according to one aspect of the present invention is the server device described above, wherein the display data indicated by the storage location information includes storage location information of link destination display data, and the display data The analysis unit reads storage position information of the display data of the link destination from the display data acquired by the display data acquisition unit, and the storage position information list generation unit reads the storage data of the display data analysis unit A list of storage location information including storage location information of link destination display data is generated.
Since this server device generates a list of storage location information including the storage location information of the link destination display data included in the display data, the data display device can link to the link destination based on the list of storage location information. By acquiring the display data in advance, when the user requests the display of the link destination, the display can be promptly performed.

[16] A server device according to an aspect of the present invention is the above-described server device, wherein the request processing unit includes an RSS file storage location information, which is a file indicating location information of display data, and a data display device. When the identification information is input from the data display device, the storage location information of the RSS file and the identification information of the data display device are associated and written to the storage location information storage unit.
Since this server apparatus receives the storage location information of the RSS file, the server device can generate a list of storage location information of the display data based on the RSS file.

  According to the present invention, a communication relay device is not required, data can be displayed at a higher speed, and a foreground job is not hindered.

1 is a system configuration diagram illustrating a schematic configuration of a content display system 1 according to a first embodiment of the present invention. It is a figure which shows the state transition of the content display apparatus 11 in the embodiment. It is a block diagram which shows schematic structure of the content display apparatus 11 in the embodiment. 5 is a diagram illustrating an example of a setting screen displayed on the image display unit 230 by the setting control unit 189 in the embodiment. FIG. It is a system block diagram which shows schematic structure of the content display system 2 in the 2nd Embodiment of this invention. It is a block diagram which shows schematic structure of the content display apparatus 12 in the embodiment. It is a block diagram which shows schematic structure of the prefetch information provision server apparatus 52 in the embodiment. 5 is a diagram illustrating an example of a setting screen displayed on the image display unit 230 by the setting control unit 289 of the content display device 12 in the embodiment. FIG. 5 is a data configuration diagram illustrating an example data configuration of an HTTP request in which the content display device 12 requests the prefetch information providing server device 52 to transmit a prefetch list in the embodiment. FIG. It is a data block diagram which shows the data structure of the prefetch list which the prefetch list production | generation part 570 produces | generates in the embodiment. It is a data block diagram which shows the data structural example of the user information which the user information storage part 530 memorize | stores in the embodiment. It is a data block diagram which shows the data structural example of the prefetch list production | generation rule in the embodiment. It is a block diagram which shows schematic structure of the content display apparatus 13 in the 3rd Embodiment of this invention. It is a block diagram which shows schematic structure of the prefetch information provision server apparatus 53 in the embodiment. 6 is a diagram illustrating an example of a setting screen output from the setting control unit 389 of the content display device 13 to the image display unit 230 in the embodiment. FIG. 5 is a diagram illustrating an example of an HTTP request header that the content display device 13 transmits to the prefetch information providing server device 53 during normal operation in the embodiment. FIG. It is a figure which shows the example of the header of the HTTP request which the content display apparatus 13 transmits to the prefetch information provision server apparatus 53 at the time of automatic execution in the same embodiment. It is a figure which shows the example of the prefetch list | wrist of the program format which the prefetch page conversion part 690 produces | generates in the same embodiment. It is a block diagram which shows schematic structure of the content display apparatus 14 in the 4th Embodiment of this invention. It is a figure which shows the state transition of the content display apparatus 14 in the embodiment. In the embodiment, the web data requesting unit 372-1 and the web data requesting unit 372-2 are flowcharts showing a processing procedure for acquiring display data. In the same embodiment, it is a flowchart which shows the process sequence of the web data request | requirement part 372-1 in the case of displaying the pre-read display data instead of an error process. FIG. 10 is a diagram illustrating an example of a display screen when performing error processing other than displaying an error message in the embodiment. It is a figure which shows the example of a screen display containing an advertisement image and a substitute image in the same embodiment. It is a figure which shows the example of a display of a bigger image containing an advertisement image in the same embodiment. It is a figure which shows the example of a display of a bigger image containing an advertisement image in the same embodiment.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a system configuration diagram showing a schematic configuration of a content display system 1 according to the first embodiment of the present invention. In FIG. 1, the content display system 1 includes a content display device (data display device) 11, content server devices 81 to 83, and the Internet (network) 91. The content display device 11 and the content server devices 81 to 83 are connected to the Internet 91.
The content display device 11 receives a television broadcast, acquires content from the content server devices 81 to 83, and displays the content. The “content” here is audio such as video, image, music, text, or a combination thereof.

The content server devices 81 to 83 transmit content to the content display device 11 in response to a request from the content display device 11. The Internet 91 transmits a communication signal between the content display device 11 and the content server devices 81 to 83.
Note that the number of content display devices connected to the Internet 91 is not limited to one, and two or more content display devices may be connected. Further, the number of content server apparatuses connected to the Internet 91 is not limited to three as shown in FIG. 1, but may be one or two, or four or more. The network to which the content display device and the content server device are connected is not limited to the Internet, and may be another network such as a local area network (LAN).

FIG. 2 is a diagram illustrating state transition of the content display device 11.
As shown in the figure, the content display device 11 takes one of a standby state, an automatic execution state, and a normal operation state.
In the normal operation state, the content display device 11 displays any one of a web page, video-on-demand content, and television broadcast as a foreground job. In the automatic execution state, the content display device 11 prefetches a web page designated in advance by the user and acquires display data. The “display data” here is data indicating an image displayed by an image display device such as a liquid crystal panel and a sound output by an audio output device such as a speaker. The display data includes web page HTML files and image data, video-on-demand content data, television broadcast image data and audio data acquired by the content display device 11 as display data. Further, the “prefetching of web page” referred to here is to acquire display data of a web page that may be displayed in the future in advance.
The content display device 11 stores the pre-read display data in the content display device 11.

In the standby state, the content display device 11 does not display content or acquire display data, but waits for a trigger for state transition, specifically, a power-on operation by a user or arrival of a preset time.
When the content display device 11 is in a standby state, when the user performs a power-on operation, the content display device 11 transitions to a normal operation state. In addition, when the content display device 11 is in a standby state, the state transitions to an automatic execution state when a preset time arrives. Here, “the arrival of a preset time” is an example of “occurrence of a predetermined event” in the present invention, and “automatic execution state” is “state transition in the present invention” It is an example of “the latter state”.
When the content display device 11 is in the automatic execution state, when the acquisition of the predetermined web page display data is completed, the state transitions to the standby state. Further, when the content display device 11 is in the automatic execution state, when a power-on operation is performed by the user, the content display device 11 stops obtaining the display data and transitions to the normal operation state.
Even when the content display device 11 is in the normal operation state, when the user performs a power-off operation, the content display device 11 transits to the automatic execution state. Here, “power-off operation is performed” is an example of “predetermined event occurs” in the present invention, and “automatic execution state” is “state after state transition” in the present invention. Is an example.
The automatic execution state is a state after the power-off operation is performed by the user, and the foreground job is not executed.

  FIG. 3 is a configuration diagram showing a schematic configuration of the content display device 11. In the figure, the content display device 11 includes a content display device main body 100 and a remote controller 110. The content display apparatus main body 100 includes a power supply unit 120, a remote control reception unit 130, a state management unit 140, a power supply display unit 150, a network transmission / reception unit 160, a control unit 170, and a data storage unit (display data storage unit, storage position information storage unit). ) 190, temporary storage unit 200, broadcast receiving unit 210, display selection unit 220, image display unit 230, and audio output unit 240. The state management unit 140 includes a timer unit 141. The control unit 170 includes a web data acquisition unit (display data acquisition unit) 171, a web data processing unit (display data processing unit) 179, a VoD (Video on Demand) data request unit 181, and VoD data. A conversion unit 186 and a setting control unit 189 are included. The web data processing unit 179 includes a web data request unit 172-1, a web data analysis unit 173-1, a web rendering unit 176, and a web data processing control unit 178. The web data acquisition unit 171 includes a web data request unit 172-2, a web data analysis unit 173-2, a web data storage unit 180, and a web data acquisition control unit 177.

The remote controller 110 includes a power button, numeric keys 1 to 9, 11, and 12, a direction button including an upper button, a lower button, a left button, and a right button, a determination button, a character type switching button, and a web page display. A display selection button including a button, a VoD content display button, a television display button, and a setting screen display button; a push button such as a VoD operation button including a fast forward button, a rewind button, a pause button, and an end button; And an infrared transmitter that outputs a signal indicating a button to the remote control receiver 130.
The power button is a button for performing a power-on operation that is an input operation for a power-on instruction and a power-off operation that is an input operation for a power-off instruction. When the content display device 11 is in the standby state or the automatic execution state, when the power button is pressed, a power-on operation is performed, and the content display device 11 transitions to a normal operation state. Further, when the content display device 11 is in the normal operation state, when the power button is pressed, a power-off operation is performed, and the content display device 11 transitions to the automatic execution state.

A numeric broadcast key is assigned to a numeric key and is used when a user selects a television broadcast to be viewed. Similarly to the numeric keys (numeric keys) of mobile phones, letters such as alphabets are assigned to the numeric keys, and characters can be input by repeatedly pressing the numeric keys.
The direction button is a button for moving a cursor displayed on the screen by the image display unit 230. The enter button is a button that is pressed when instructing to start processing of the item at the cursor position moved by the direction button. The enter button is pressed when a character input is performed and then the input character string is confirmed. The character type switching button is a button for switching a character type (for example, a half-size lowercase alphabet or a full-size number) to be input when performing character input.
The display selection button is a button for selecting an image to be displayed by the image display unit 230. The VoD operation button is a button for operating the content while viewing the video-on-demand content.
When the user presses the button, the remote controller 110 outputs an infrared signal indicating the pressed button from the infrared transmission unit.

  The power supply unit 120 supplies power to each unit of the content display apparatus main body 100 under the control of the state management unit 140. When the content display device 11 is in a normal operation state, the power supply unit 120 is connected to the remote control receiving unit 130, the state management unit 140, the power display unit 150, the network transmission / reception unit 160, the control unit 170, the data storage unit 190, and the temporary storage unit. 200, the broadcast receiving unit 210, the display selection unit 220, the image display unit 230, and the audio output unit 240 are all supplied with power. On the other hand, when the content display device 11 is in the automatic execution state, the power supply unit 120 includes the remote control reception unit 130, the state management unit 140, the control unit 170, the network transmission / reception unit 160, the data storage unit 190, and the temporary storage unit 200. Only supply power. When the content display device 11 is in a standby state, the power supply unit 120 supplies power only to the remote control receiving unit 130 and the state management unit 140. Note that the data storage unit 190 is a non-volatile storage device, and contents are retained even when power is not supplied, but reading and writing cannot be performed when power is not supplied.

  Remote control receiving unit 130 receives the infrared signal output from remote control 110. When receiving a signal indicating that the power button has been pressed, remote control receiving unit 130 outputs the signal to state management unit 140. In addition, when any of the display selection buttons is pressed and a signal indicating the pressed button is received, the remote control reception unit 130 outputs the signal to the display selection unit 220. In addition, when any of the numeric keys is pressed and a signal indicating the pressed button is received, the remote control receiving unit 130 outputs the signal to the control unit 170 and the broadcast receiving unit 210. In addition, when any one of the direction button, the determination button, the character type switching button, and the VoD operation button is pressed and the remote control receiving unit 130 receives a signal indicating the pressed button, the remote control receiving unit 130 transmits the signal to the control unit 170. Output to.

When a preset time such as midnight is reached, the timer unit 141 outputs a signal indicating that the preset time is reached and the set time. As described with reference to FIG. 2, the state management unit 140 outputs a signal indicating that the power button has been pressed (power on instruction or power off instruction) from the remote control receiver 130 or a set time. When a signal indicating that the state is reached is output from the timer unit 141, the state of the content display device 11 is changed. The state management unit 140 controls whether the power supply unit 120 supplies power to each unit including the image display unit 230 according to the state of the content display device 11.
The power supply display unit 150 includes a lamp. When the content display device 11 is in a normal operation state, the lamp is turned on, and when the content display device 11 is in an automatic execution state or a standby state, the lamp is turned off. indicate.
The network transmission / reception unit 160 is connected to the Internet 91 and transmits / receives signals to / from the Internet 91.

  The control unit 170 is realized by having a built-in CPU (Central Processing Unit) read the program stored in the data storage unit 190 into the temporary storage unit 200 and execute it. In the normal operation state, the control unit 170 operates the web data processing unit 179, the VoD data request unit 181, the VoD data conversion unit 186, and the setting control unit 189 among the components constituting the control unit 170. On the other hand, in the automatic execution state, the control unit 170 operates only the web data acquisition unit 171 among the parts constituting the control unit 170.

  The web data processing control unit 178 outputs the URL (Uniform Resource Locator; unified resource location specifier, storage location information) of the web page to be displayed on the image display unit 230 to the web data request unit 172-1. The processing unit 179 controls the timing at which image data is acquired. Specifically, when a signal indicating that the web page display button has been pressed is output from the remote controller 110, the web data processing control unit 178 reads the URL of the home page from the data storage unit 190 and the web data request unit 172. Output to -1. In addition, when a URL is designated by a user's remote control operation, the web data processing control unit 178 outputs the designated URL to the web data request unit 172-1.

The web data request unit 172-1 sends HTTP to the content server apparatuses 81 to 83 via the network transmission / reception unit 160 and the Internet 91 based on the URL output from the web data processing control unit 178 and the web data analysis unit 173-1. A (Hypertext Transfer Protocol) request is transmitted, and display data is acquired as an HTTP response. The “HTTP request” here is a signal according to HTTP that requests the server apparatuses 81 to 83 to transmit a response signal (HTTP response).
The web data requesting unit 172-1 associates the acquired display data with the URL and the acquisition time (the time when the web data requesting unit 172-1 acquired the display data), and outputs it to the web data analyzing unit 173-1. .

The web data analysis unit 173-1 displays web data such as image data to be pasted on a web page to be displayed on the image display unit 230 from display data input from the web data request unit 172-1. Read the URL of the storage location of the necessary data. The web data analysis unit 173-1 outputs the read URL to the web data request unit 172-1. Further, the web data analyzing unit 173-1 outputs the display data input from the web data requesting unit 172-1 to the web rendering unit 176.
The web rendering unit 176 generates image data displayed by the image display unit 230 and audio data output by the audio output unit 240 based on the display data output from the web data analysis unit 173-1. The web rendering unit 176 outputs the generated image data and audio data to the display selection unit 220.

  When the web data acquisition control unit 177 enters the automatic execution state, the web data acquisition unit 171 controls the timing at which the web data acquisition unit 171 performs prefetching by outputting the URL of the web page to be prefetched to the web data request unit 172-2. Specifically, in the normal operation state, a signal indicating that the set time has been reached when the power button of the remote controller 110 is pressed and the content display device 11 transitions to the automatic execution state and in the standby state. When the content display device 11 is output from the timer unit 141 and the content display device 11 transitions to the automatic execution state, the web data acquisition control unit 177 reads the URL of the web page to be prefetched from the data storage unit 190, and the read URL is the web data. It outputs to the request part 172-2.

Based on the URL output from the web data acquisition control unit 177, the web data request unit 172-2 transmits an HTTP request to the content server apparatuses 81 to 83 via the network transmission / reception unit 160 and the Internet 91, and as an HTTP response. Get display data. The web data requesting unit 172-2 outputs the acquired display data in association with the URL and the acquisition time to the web data analyzing unit 173-2.
The web data analysis unit 173-2 is necessary when displaying the web page to be prefetched, such as image data to be pasted on the web page to be prefetched, from the display data input from the web data request unit 172-2. Read the URL of the data storage location. The web data analyzing unit 173-2 outputs the read URL to the web data requesting unit 172-2. The web data analysis unit 173-2 associates the display data input from the web data request unit 172-2 with the URL input from the web data request unit 172-2 and the acquisition time, and stores the web data storage unit. Output to 180.
The web data storage unit 180 writes the display data, the URL, and the acquisition time output from the web data analysis unit 173-2 in the data storage unit 190 in association with each other.

  The VoD data request unit 181 operates when the content display device 11 is in a normal operation state, and sends a distribution request signal for requesting distribution of video-on-demand content specified by the user to the network transmission / reception unit 160 and the Internet. The content data stream is transmitted to the content server apparatuses 81 to 83 via 91, and the data stream of the content is acquired. In addition, when the VoD operation button is pressed and a signal indicating the pressed button is output from the remote control receiving unit 130, the VoD data request unit 181 outputs an operation request signal that instructs an operation corresponding to the pressed button. The content data is transmitted to the content server apparatuses 81 to 83 via the network transmission / reception unit 160 and the Internet 91, and a data stream of content corresponding to the instructed operation is acquired. The VoD data request unit 181 outputs the acquired data stream to the VoD data conversion unit 186.

The VoD data conversion unit 186 operates when the content display device 11 is in a normal operation state, converts the content data stream output from the VoD data request unit 181 and generates an MPEG (Moving Picture Experts Group) stream The generated MPEG stream is output to the display selection unit 220.
The setting control unit 189 operates when the content display device 11 is in a normal operation state, displays a setting screen on the image display unit 230 via the display selection unit 220, and accepts a setting input from the remote controller 110 by a user operation. . The setting screen will be described later.
The data storage unit 190 includes items set on the setting screen such as a home page URL and a prefetch page URL, prefetch result display data output from the web data storage unit 180, a program executed by the control unit 170, and the like. Stores various data.
The temporary storage unit 200 is a working memory in which the control unit 170 temporarily stores data.

The broadcast receiving unit 210 is connected to a television broadcast receiving antenna, receives and demodulates a broadcast wave of the television broadcast, generates an MPEG stream, and outputs the MPEG stream to the display selection unit 220. Instead of the broadcast receiving unit 210, a set box connected to a cable television network may be used.
The display selection unit 220 is output from any of the web rendering unit 176, the VoD data conversion unit 186, the setting control unit 189, and the broadcast reception unit 210 in accordance with a signal indicating a user operation output from the remote control reception unit 130. Image data is extracted from the selected data and output to the image display unit 230, and audio data is extracted and output to the audio output unit 240. The image display unit 230 includes, for example, a liquid crystal panel, and displays an image based on the image data output from the display selection unit 220. The audio output unit 240 includes a speaker and outputs audio based on audio data output from the display selection unit 220.

  The web data acquisition control unit 177, the web data request unit 172-2, the web data analysis unit 173-2, and the web data storage unit 180 function as a web data acquisition unit 171. In the automatic execution state, the web data acquisition control unit 177 acquires the URL to be prefetched from the data storage unit 190, and the web data request unit 172-2 and the web data analysis unit 173-2 display data based on the acquired URL. The web data storage unit 180 writes the acquired display data in the data storage unit 190 in association with the URL and the acquisition time.

  Further, the web data processing control unit 178, the web data request unit 172-1, the web data analysis unit 173-1, and the web rendering unit 176 function as a web data processing unit 179. When the state management unit 140 controls the power supply unit 120 to supply power to the image display unit 230, that is, when the URL is input in the normal operation state, the web data processing unit 179 receives the URL. Accept input. The web data request unit 172-1 of the web data processing unit 179 determines whether or not the data storage unit 190 stores the input URL and display data in association with each other. When it is determined that it is stored, the display data stored in association with the input URL is read. When it is determined that it is not stored, the content server devices 81 to 83 are used as described later. Get display data. Further, as will be described later, the web data analyzing unit 173-1 analyzes the display data acquired by the web data requesting unit 172-1, and the web data requesting unit further acquires display data based on the analysis result, The web rendering unit 176 generates image data based on the display data, whereby an image based on the display data acquired by the web data requesting unit 172-1 is displayed on the image display unit 230 via the display selection unit 220. Display.

FIG. 4 is a diagram illustrating an example of a setting screen displayed on the image display unit 230 by the setting control unit 189. When a signal indicating that the setting screen display button is pressed is transmitted from the remote controller 110 according to the user operation, the setting control unit 189 outputs the image data of the setting screen, and the display selection unit 220 is output from the setting control unit 189. By selecting image data to be displayed, the image display unit 230 displays a setting screen. On the setting screen, the web page prefetching performed by the web data acquisition unit 171 is set and stored in the data storage unit 190 as a prefetch target URL.
In the homepage input field A1 in the figure, the URL of a web page that the content display device 11 displays as a homepage is entered. In the example of the figure, “http://example.com” is input as the URL of the home page. In the input fields A2 to A4 of the prefetch pages 1 to 3, the web data URL to be prefetched by the web data acquisition unit 171 is input. The web data acquisition unit 171 prefetches the home page and the prefetch page set on the setting screen.

In the prefetch time input fields T1 to T4, the time when the web data acquisition unit 171 performs prefetching is input for each homepage and prefetch page. For example, the prefetch time input field T2 of the prefetch page 1 in the figure is set to “AM 2:00”, that is, 2:00 am. When the content display device 11 is in a standby state at 2 am, the content display device 11 transitions to an automatic execution state and performs prefetching based on the URL set in the prefetch page 1. “Automatic” input in the input field T1 corresponding to the home page and the input field T3 corresponding to the prefetch page 2 indicates a setting for performing prefetching at a predetermined time using a random number, for example. Alternatively, the web data acquisition control unit 177 may determine a time zone that is not frequently used from the history of usage time of the content display device 11 by the user, and set the prefetch time in that time zone. In addition, “----” in the input field T4 corresponding to the prefetch page 3 indicates no input. Since the URL of the prefetch page 3 is not set, the prefetch time input field T4 corresponding to this URL is not set.
In the capacity input fields C1 to C3, the memory capacity of the data storage unit 190 assigned to each prefetch page is input. In the example of FIG. 4, the prefetch page 1 is allocated with 40% of the memory capacity of the data storage unit 190 used for storing the prefetch result. Of the memory capacity of the data storage unit 190, 10% of the memory capacity used for storing the prefetch result is allocated to the prefetch page 2. Of the memory capacity of the data storage unit 190, 50%, which is the entire remaining memory capacity used for storing the prefetch results, is allocated to the home page.

Next, the operation of the content display device 11 will be described.
First, the operation of the content display device 11 in the normal operation state will be described.
In the normal operation state, the content display device 11 displays a web page, a video-on-demand content, or a television broadcast according to a user operation. Alternatively, settings relating to prefetching of web pages are performed in accordance with user operations. When a display selection button for selecting one of these is pressed by the user, the remote controller 110 outputs a signal indicating the pressed button. The display selection unit 220 receives this signal output via the remote control reception unit 130 and switches the display according to the signal. Further, in the normal operation state, the power display unit 150 lights the power lamp according to the control of the state management unit 140.

First, display of a web page will be described.
When the web page display button is pressed by the user, the remote controller 110 outputs a signal indicating that the web page display button has been pressed.
When the web data processing control unit 178 receives the output of the signal indicating that the web page display button has been pressed via the remote control receiving unit 130, the web data processing control unit 178 reads the URL of the home page from the data storage unit 190. Thereafter, the web data processing unit 179 displays a browser screen on the image display unit 230 according to a procedure to be described later for displaying a web page, and displays an image of the home page in the browser screen. The browser screen has an input field for inputting a URL, and the user can specify the URL by inputting the URL into the input field using the remote controller 110 and pressing the enter button.

When the URL of the web page to be displayed is designated by a user operation while the display of the web page is selected, the web data processing unit 179 displays the image of the designated web page by the following procedure. . Here, the web page to be displayed, whose URL is specified by the user, is a web page provided by any of the content server devices 81 to 83.
First, the web data processing control unit 178 outputs the URL specified by the user to the web data request unit 172-1. The web data requesting unit 172-1 determines whether or not the display data of the HTML file is stored in the data storage unit 190 in association with the URL output from the web data processing control unit 178. The acquisition time is also used for this determination, and the web data requesting unit 172-1 determines that display data having an elapsed time after acquisition is longer than a predetermined valid period is invalid. The web data requesting unit 172-1 deletes the display data determined to be invalid from the data storage unit 190, and determines that the display data is not stored in the data storage unit 190.
If it is determined that the data is stored, the web data requesting unit 172-1 reads the display data from the data storage unit 190 and outputs it to the web data analyzing unit 173-1. If it is determined that it is not stored, an HTTP request for requesting transmission of display data to the designated URL is generated and output to the network transmission / reception unit 160. For these operations, a technique generally used as HTTP cache processing can be used.

The network transmission / reception unit 160 transmits the HTTP request output from the web data request unit 172-1 to the URL. The network transmission / reception unit 160 receives the display data of the HTML file corresponding to the transmitted HTTP request as an HTTP response, and outputs the received HTML file to the web data request unit 172-1. The web data requesting unit 172-1 outputs the HTML file output from the network transmitting / receiving unit 160 to the web data analyzing unit 173-1 in association with the URL as the destination.
When the HTML file is output from the web data requesting unit 172-1, the web data analyzing unit 173-1 analyzes the output HTML file and displays the web page such as image data to be pasted on the web page. The URL of the storage location of display data necessary for display is read. The web data analysis unit 173-1 outputs the read URL to the web data request unit 172-1.

The web data request unit 172-1 acquires the display data corresponding to the URL output from the web data analysis unit 173-1 from the data storage unit 190 as described above or as an HTTP response to the HTTP request, The acquired display data and the URL output from the web data analysis unit 173-1 are associated with each other and output to the web data analysis unit 173-1.
The web data analyzing unit 173-1 associates display data such as an HTML file and image data output from the web data requesting unit 172-1 with a URL output from the web data requesting unit 172-1, and a web rendering unit To 176.

The web rendering unit 176 generates bid map data of an image displayed by the image display unit 230 and audio data output by the audio output unit 240 based on the display data output from the web data analysis unit 173-1. To the display selection unit 220. The web rendering unit 176 generates bitmap data of a browser screen that displays a web page image as an image displayed by the image display unit 230.
The display selection unit 220 outputs the image data output from the web rendering unit 176 to the image display unit 230 and outputs the audio data to the audio output unit 240. The image display unit 230 displays an image based on the image data output from the display selection unit 220. The audio output unit 240 outputs audio based on the audio data output from the display selection unit 220.

Next, display of video-on-demand content will be described.
When the VoD content display button is pressed by the user, the remote controller 110 outputs a signal indicating that the VoD content display button has been pressed.
When receiving a signal indicating that the VoD content display button has been pressed via the remote control receiving unit 130, the VoD data requesting unit 181 outputs image data of an initial screen for displaying video-on-demand content. The image is displayed on the image display unit 230 via the VoD data conversion unit 186 and the display selection unit 220. The initial screen for displaying video-on-demand content has an input field for inputting a URL, and the user inputs the URL into the input field using the remote controller 110 and presses the enter button, whereby the content server apparatus Any of 81 to 83 can specify a URL that provides video-on-demand content.

  When the display of the video on demand content is selected and the URL indicating the request destination of the video on demand content to be displayed is specified by the user's operation, the VoD data request unit 181 displays the URL. An HTTP request addressed to the designated URL that requests data transmission of the content to be generated is generated and output to the network transmission / reception unit 160. The network transmission / reception unit 160 transmits the HTTP request output from the VoD data request unit 181 to the URL. When the data stream corresponding to the transmitted HTTP request is received by the HTTP response, the network transmission / reception unit 160 outputs the received data stream to the VoD data request unit 181, and the VoD data request unit 181 outputs from the network transmission / reception unit 160. The data stream is output to the VoD data converter 186. The VoD data conversion unit 186 converts the data stream output from the VoD data request unit 181 into an MPEG data stream and outputs it to the display selection unit 220.

The display selection unit 220 extracts an image data stream and an audio data stream from the MPEG data stream output from the VoD data conversion unit 186, outputs the image data stream to the image display unit 230, and outputs an audio data stream. Is output to the audio output unit 240. The image display unit 230 displays an image based on the image data stream output from the display selection unit 220. The audio output unit 240 outputs audio based on the audio data stream output from the display selection unit 220.
In addition, when a signal indicating an operation such as fast-forward or rewind is input by a user operation, the VoD data request unit 181 requests the operation according to the input signal, and the URL of the video-on-demand distribution source A destination operation request signal is generated and output to the network transmission / reception unit 160. The network transmission / reception unit 160 transmits the operation request signal output from the VoD data request unit 181 to the URL. The content server apparatuses 81 to 83 that have received the operation request signal transmit a data stream corresponding to the operation indicated by the received operation request signal. Thereafter, in the same manner as described above, the image display unit 230 displays an image, and the sound output unit 240 outputs sound. Thereby, the content display apparatus 11 can display the content according to a user's operation. Note that a protocol other than HTTP, for example, RTP (Real-time Transport Protocol), RTCP (RTP Control Protocol), or the like can be used to acquire the data stream.

Next, TV broadcast display will be described.
When the user presses the TV display button, the remote controller 110 outputs a signal indicating that the TV display button has been pressed.
When the broadcast receiving unit 210 receives an output of a signal indicating that the television display button has been pressed via the remote control receiving unit 130, the broadcast receiving unit 210 reads information on a channel to be displayed from the data storage unit 190. The broadcast receiving unit 210 receives a radio signal of television broadcasting, demodulates a channel indicated by information read from the data storage unit 190, and generates an MPEG data stream. The broadcast receiving unit 210 outputs the generated MPEG data stream to the display selection unit 220.

The display selection unit 220 extracts an image data stream and an audio data stream from the MPEG data stream output from the broadcast reception unit 210, outputs the image data stream to the image display unit 230, and outputs the audio data stream. Output to the audio output unit 240. The image display unit 230 displays an image based on the image data stream output from the display selection unit 220. The audio output unit 240 outputs audio based on the audio data stream output from the display selection unit 220.
When a channel is selected by the user pressing a numeric key on the remote controller 110 while a television broadcast is being displayed, the broadcast receiving unit 210 demodulates the selected channel to generate an MPEG data stream. Thereafter, the television broadcast of the channel selected by the user is displayed in the same manner as described above. In addition, the broadcast receiving unit 210 writes information indicating the selected channel in the data storage unit 190. This information is used to display again the channel that was last viewed when the user turned on the power.

Next, web page prefetch setting will be described.
When the setting screen display button is pressed by the user, the remote controller 110 outputs a signal indicating that the setting screen display button has been pressed.
When the setting control unit 189 receives an output of a signal indicating that the setting screen display button has been pressed via the remote control receiving unit 130, the setting control unit 189 sends setting screen display data to the image display unit 230 via the display selection unit 220. Is output. The display selection unit 220 displays a setting screen based on the setting screen display data output from the setting control unit 189. The image display unit 230 displays the screen shown in FIG. 4 described above as the setting screen.
When the URL of the home page, the URL of the web page to be prefetched, the prefetching time, and the upper limit of the memory capacity used for prefetching are input by the user's remote control operation, the setting control unit 189 stores these input data as data storage Write to part 190.

Next, state transition from the normal operation state to another state will be described.
When the remote controller 110 outputs a signal indicating that the user has pressed the power button in the normal operation state, the remote control receiver 130 receives this signal and outputs it to the state manager 140. Receiving the output of the signal indicating that the power button has been pressed, the state management unit 140 determines the state of the content display device 11 after the state transition from the current state of the display device 11. Here, since the display device 11 is in the normal operation state, the state management unit 140 shifts to the automatic execution state in which the power supply unit 120 does not supply power to the image display unit 230 as described in FIG. Judge that. Then, the content display device 11 is switched to the automatic execution state. In addition, the state management unit 140 outputs a signal indicating the transition to the automatic execution state to the power supply unit 120, whereby the power supply unit 120 supplies power to the image display unit 230, the audio output unit 240, and the broadcast reception unit 210. Control not to supply. In addition, the state management unit 140 outputs a signal indicating transition to the automatic execution state to the control unit 170, so that the control unit 170 causes the web data processing unit 179, the VoD data request unit 181 and the VoD data conversion unit 186 to The operation with the setting control unit 189 is terminated, and control is performed so that the web page is prefetched as described later.

Next, the operation of the content display device 11 in the automatic execution state will be described.
As described above, in the automatic execution state, the control unit 170 operates only the web data acquisition unit 171, and the web data processing unit 179, the VoD data request unit 181, the VoD data conversion unit 186, and the setting control unit 189 operate. I won't let you.
When the power button is pressed in the normal operation state and in the standby state, a signal indicating that the time set by the timer unit 141 (the time input in the pre-read time input field on the setting screen) has been output is output. The content display device 11 transitions to the automatic execution state. Specifically, the state management unit 140 determines the state of the content display device 11 after the state transition, and switches the content display device 11 to the automatic execution state. Further, the state management unit 140 outputs a signal indicating transition to the automatic execution state to the control unit 170.

When a signal indicating the transition to the automatic execution state is input, the web data acquisition control unit 177 of the control unit 170 collects the URL of the homepage to be prefetched and the URL of the prefetch page (hereinafter, these are collectively expressed as “ Is also read from the data storage unit 190. When transitioning to the automatic execution state when the power button is pressed, the state management unit 140 outputs a signal indicating that the power button is shifted to the automatic execution state to the web data acquisition control unit 177. Upon receiving the signal output from the state management unit 140, the web data acquisition control unit 177 reads the prefetch target URL from the data storage unit 190. On the other hand, when transitioning to the automatic execution state due to the set time, the timer unit 141 outputs a signal indicating the time to the state management unit 140 including a signal indicating the set time. The state management unit 140 outputs the signal output from the timer unit 141 to the web data acquisition control unit 177. The web data acquisition control unit 177 reads, from the data storage unit 190, the URL in which the time input from the state management unit 140 is set as the prefetch time among the prefetch target URLs.
Further, when reading the URL from the data storage unit 190, the web data acquisition control unit 177 reads together the storage capacity assigned to the URL. The web data acquisition control unit 177 associates the URL read from the data storage unit 190 with the storage capacity, and outputs the URL to the web data request unit 172-2.

  Even when the content display device 11 is in a power-off state (standby state or automatic execution state) for a long period of time when the content display device 11 transitions to the automatic execution state at the set time and performs prefetching, the content display device 11 periodically prefetches. It is possible to respond to the update of the homepage and the prefetch page. In addition, by making a transition to the automatic execution state when the power button is pressed, prefetching can be performed even when the content display device 11 is in the power-on state (normal operation state) at the set time.

  Note that the timing at which the content display device 11 performs prefetching is not limited to the above, and for example, the user may set for each homepage or prefetch page whether prefetching is performed at a set time or when power is turned off. Alternatively, the content display device 11 may perform prefetching only when a power button is pressed only for a homepage or a prefetch page that cannot be prefetched at the set time. In this case, the data storage unit 190 stores a flag indicating whether or not prefetching is performed at the set time for each homepage or prefetched page, and the state management unit 140 sets the flag if the normal operation state is set at the set time. “No prefetching”. When the automatic execution state is entered by pressing the power button, the web data acquisition unit 171 pre-reads only the URL whose flag is “pre-read unexecuted”, and sets the flag of the URL that has been pre-read as “pre-read executed”. To do.

  The web data request unit 172-2 generates an HTTP request for each of the URLs output from the web data acquisition control unit 177, and outputs the generated HTTP request to the network transmission / reception unit 160. The network transmission / reception unit 160 transmits the HTTP request output from the web data request unit 172-2 to the URL. The network transmission / reception unit 160 receives the display data of the HTML file corresponding to the transmitted HTTP request as an HTTP response, and outputs the received HTML file to the web data request unit 172-2. The web data request unit 172-2 associates the HTML file output from the network transmission / reception unit 160 with the URL and storage capacity output from the web data acquisition control unit 177, and outputs the HTML file to the web data analysis unit 173-2.

When the HTML file is output from the web data requesting unit 172-2, the web data analysis unit 173-2 analyzes the output HTML file and displays the web page such as image data to be pasted on the web page. The URL of display data necessary for display is read. The web data analysis unit 173-2 outputs the read URL to the web data request unit 172-2.
The web data request unit 172-2 generates an HTTP request based on the URL output from the web data analysis unit 173-2, acquires an HTTP response as in the case of the web data request unit 172-1. The data is output to the web data analysis unit 173-2.
The web data analysis unit 173-2 outputs display data such as an HTML file or image data output from the web data request unit 172-2 to the web data storage unit 180 in association with the URL of the display data. .

  The web data storage unit 180 writes the display data output from the web data analysis unit 173-2 in the data storage unit 190 in association with the URL of the display data. At that time, the web data storage unit 180 determines the validity of the prefetch result of the prefetch target home page or the prefetch page from information such as the acquisition time in the same manner as the data validity judgment in the web data request unit 172-1. The data determined to be invalid is deleted from the data storage unit 190 in advance. On the other hand, the amount of communication can be reduced by not prefetching data determined to be valid. Then, the data size of the display data output from the web data analysis unit 173-2 is detected, the total data size to be written in the data storage unit 190 is calculated for each homepage or prefetched page, and the web data analysis unit 173-3 is calculated. If the total data size written in the data storage unit 190 is larger than the storage capacity output from the web data analysis unit 173-2, compared with the storage capacity output from 2, the homepage or the prefetched page Thereafter, prefetching and writing of display data to the data storage unit 190 are stopped.

When the display data necessary for displaying the home page and the prefetch page has been written into the data storage unit 190, the web data storage unit 180 outputs a signal indicating that the processing has been completed to the state management unit 140. For example, the web data storage unit 180 performs a process for all URLs input from the web data request unit 172-2 and notification that all the prefetch target URLs have been output from the web data analysis unit 173-2. When the notification of the completion is received and the recording of all the display data is completed, it is determined that the processing is completed and the above signal is output.
When the signal indicating that the processing is completed is output, the state management unit 140 switches the state of the content display device 11 to the standby state. In addition, the state management unit 140 controls the power supply unit 120 to supply power only to the state management unit 140 and the remote control reception unit 130 by outputting a signal indicating transition to the standby state to the power supply unit 120.
On the other hand, when a power-on instruction is input by a user's remote control operation in the automatic execution state, the state management unit 140 switches the state of the content display device 11 to the normal operation state. Further, the state management unit 140 outputs a signal indicating transition to the normal operation state to the control unit 170 and the power supply unit 120.

The web data requesting unit 172-2 of the web data acquiring unit 171 acquires display data by prefetching a web page when the control unit 170 receives an output of a signal indicating transition to the normal operation state. Cancels acquisition of display data and releases hardware resources used for prefetching. That is, the state management unit 140 outputs a signal indicating the transition to the normal motion operation state to the control unit 170, so that when the web data acquisition unit 171 acquires the display data, the display data of the display data is displayed. Control acquisition to be stopped.
In addition, the control unit 170 causes the web rendering unit 176, the VoD data request unit 181, the VoD data conversion unit 186, and the setting control unit 189 to operate.
When receiving the output of the signal indicating that the power supply unit 120 transitions to the normal operation state, the remote control receiving unit 130, the state management unit 140, the network transmission / reception unit 160, the control unit 170, the data storage unit 190, and the temporary storage unit 200 Power is supplied to all of the broadcast receiving unit 210, the display selection unit 220, the image display unit 230, and the audio output unit 240. In other words, the state management unit 140 controls the power supply unit 120 to supply power to each unit including the image display unit 230 by outputting a signal indicating that the state is changed to the normal operation state.

Next, the operation of the content display device 11 in the standby state will be described.
In the standby state, the content display device 11 does not acquire or display content nor prefetch web pages.
In both the automatic execution state and the standby state, the power display unit 150 turns off the lamp, the image display unit 230 does not display an image, and the audio output unit 240 does not output audio. For this reason, the automatic execution state and the standby state are not distinguished in appearance.
In the standby state, when a power-on instruction is input by a user's remote control operation, the state management unit 140 changes the state of the content display device 11 to the normal operation state described above. In a standby state, when a signal indicating that the prefetch start time has come is output from the timer unit 141, the state management unit 140 determines the state of the display device 11. Here, it is determined that the state of the display device 11 after the set time has arrived is an automatic execution state in which the power supply unit 120 does not supply power to the image display unit 230, and the state of the content display device 11 is changed to the above-described automatic execution state. The web data acquisition unit 171 controls the web data to be prefetched.

As described above, the content display device 11 performs prefetching of the web page in an automatic execution state in which foreground processing is not performed, so that data can be displayed at a higher speed and the foreground job is not hindered. . For example, when video-on-demand content is displayed in the foreground, a high load is applied to the control unit 170, a large amount of memory capacity is required in the temporary storage unit 200, and data that the network transmission / reception unit 160 receives a data stream. The throughput (communication speed) must also be large (fast). In such a case, prefetching a web page and acquiring display data may cause problems such as inability to smoothly reproduce video-on-demand content or a delay in response to a user's remote control operation. is there. Furthermore, when the data throughput exceeds the line speed connecting the network transmission / reception unit 160 and the Internet 91, video on demand data is lost, causing block noise and frame dropping. On the other hand, since the content display device 11 does not perform prefetching of the web page simultaneously with the display of the video-on-demand content, these problems do not occur. Since the data storage unit 190 stores the pre-read display data in association with the URL, when displaying the web page in the foreground, the web data request unit 172 first corresponds to the URL of the web page to be displayed. It is determined whether or not the display data to be stored is stored in the data storage unit 190. If it is determined that the display data is stored, the display data is read from the content server devices 81 to 83 and used. No need to get Thereby, even if the communication speed with the internet 91 is slow, a web page can be displayed faster.
Further, since the content display device 11 performs prefetching of the web page by itself, it does not require a communication relay device that prefetches the web page in place of the client device (content display device).

The content display device 11 may prefetch a web page set as a bookmark. Here, the “bookmark” is a function for registering the URL of a web page frequently browsed by the user in the browser. When the content display device 11 prefetches the web page set as the bookmark, the user need not set the prefetch page.
When the web page is displayed in the normal operation state, the web data request unit 172 writes the web page display data acquired from the content server devices 81 to 83 in the data storage unit 190 in association with the URL. Also good. Thereby, when displaying the same web page again, since the display data can be acquired from the data storage unit 190, it can be displayed at high speed.
Note that the input of the power-on instruction and the power-off instruction are not limited to pressing the power button. For example, the content display device 11 may include a power timer unit, and the power timer unit may output a power on instruction or a power off instruction at a set time.

  Note that the web data requesting unit 172-1 and the web data requesting unit 172-2 may be realized by the same program. The web data requesting unit 172-1 and the web data requesting unit 172-2 both transmit an HTTP request based on the input URL and acquire display data, and can be realized by the same program. it can. By realizing both with the same program, the storage capacity of the program can be reduced. Similarly, the web data analysis unit 173-1 and the web data analysis unit 173-2 may be executed by the same program. The web data analysis unit 173-1 and the web data analysis unit 173-2 both read URLs such as image data to be pasted on the web page from the display data, and can be realized by the same program. . By realizing both with the same program, the storage capacity of the program can be reduced.

<Second Embodiment>
FIG. 5 is a system configuration diagram showing a schematic configuration of the content display system 2 in the second embodiment of the present invention. In FIG. 1, the content display system 2 includes a content display device (data display device) 12, a prefetch information providing server device (server device) 52, content server devices 81 to 83, and the Internet (network) 91. . The content display device 12, the prefetch information providing server device 52, and the content server devices 81 to 83 are connected to the Internet 91.
In the figure, the same reference numerals (81 to 83, 91) are assigned to portions corresponding to the respective portions in FIG.

The content display device 12 transmits an HTTP request for requesting a prefetch list (a list of storage position information), which is a list of web pages to be prefetched, to the prefetch information providing server device 52, receives the prefetch list, and receives the prefetch list. Prefetch web pages based on
The prefetch information providing server device 52 generates a prefetch list based on information of the content display device 12 registered in advance. When the prefetch information providing server device 52 receives an HTTP request for requesting a prefetch list from the content display device 12, the prefetch information providing server device 52 transmits the generated prefetch list.
As in the case of FIG. 1, the number of content display devices connected to the Internet 91 is not limited to one, and may be two or more. Further, the number of content server apparatuses connected to the Internet 91 is not limited to three as shown in FIG. 5, and may be one, two, or four or more. Also, the number of prefetch information providing server devices 52 connected to the Internet 91 is not limited to one, and may be two or more. The network to which the content display device, the content server device, and the prefetch information providing server device are connected is not limited to the Internet, and may be another network such as a local area network (LAN).

FIG. 6 is a configuration diagram showing a schematic configuration of the content display device 12. In the figure, the content display device 12 includes a content display device main body 101 and a remote controller 110. The content display apparatus main body 101 includes a power supply unit 120, a remote control reception unit 130, a state management unit 140, a power supply display unit 150, a network transmission / reception unit 160, a control unit 270, and a data storage unit (display data storage unit, storage location information storage unit). ) 190, temporary storage unit 200, broadcast receiving unit 210, display selection unit 220, image display unit 230, and audio output unit 240. The state management unit 140 includes a timer unit 141. The control unit 270 includes a web data acquisition unit (display data acquisition unit) 271, a web data processing unit (display data processing unit) 179, a VoD data request unit 181, a VoD data conversion unit 186, and a setting control unit 289. Consists of. The web data processing unit 179 includes a web data request unit 172-1, a web data analysis unit 173-1, a web rendering unit 176, and a web data processing control unit 178. The web data acquisition unit 271 includes a web data request unit 172-2, a web data storage unit 180, a web data acquisition control unit 177, a prefetch list request unit 274, and a prefetch list analysis unit 275. As will be described later, in this embodiment, the prefetch information providing server device 52 reads the URL of the link destination included in the web page to be prefetched and transmits it to the content display device 12 as a prefetch list. For this reason, the content display device 12 does not need to operate the web data analysis unit at the time of prefetching the web page. Therefore, unlike the case of FIG. 3, the web data acquisition unit 271 does not include the web data analysis unit.
In the figure, the same reference numerals (110, 120, 130, 140, 150, 160, 172-1, 172-2, 173-1, 176, 177, 178, 179, 180, 181, 186, 190, 200, 210, 220, 230, 240), and the description thereof is omitted.

The prefetch list request unit 274 operates in an automatic execution state, reads the URL of the prefetch list request destination from the data storage unit 190, generates an HTTP request for requesting transmission of the prefetch list, and sends the generated HTTP request to the network transmission / reception unit. 160 and the URL 91 of the prefetch list request destination via the Internet 91. The URL of the prefetch list request destination is the URL on the prefetch information providing server device 52.
The prefetch list analysis unit 275 operates in the automatic execution state, reads the URL of the web page to be prefetched from the prefetch list received as an HTTP response from the prefetch information providing server device 52, and reads the read URL as the web data request unit 172- Output to 2.
The setting control unit 289 displays a setting screen in which the setting item “prefetch list request destination” is added to the setting screen displayed by the setting control unit 189 of the content display device 11 on the image display unit 230 and accepts a user setting input. . The setting control unit 289 receives the URL set on the setting screen and set as the prefetch target and information indicating the storage capacity allocated to each URL via the network transmission / reception unit 160 and the Internet 91. Transmit to device 52.

FIG. 7 is a configuration diagram showing a schematic configuration of the prefetch information providing server device 52. In the figure, a prefetch information providing server device 52 includes a content display device request processing unit (request processing unit) 510, a user information storage unit 530, a prefetch list generation control unit 540, and a content access unit (display data acquisition unit) 550. A content analysis unit (display data analysis unit) 560, a prefetch list generation unit (list generation unit) 570, and a prefetch list generation rule storage unit 580 are configured.
The user information storage unit 530 stores, for each content display device, user information such as a URL of a web page to be prefetched by the content display device and a generated prefetch list transmitted to the content display device. The URL of the web page to be prefetched by the content display device is the URL on the content server devices 81-83.
In the following, the URL of the web page to be prefetched by the content display device is also referred to as “starting location information”. The starting point storage position information is a URL indicating a web page that is a starting point from which the prefetch information providing server device 52 searches for a link on the Internet 91 and acquires a URL to be included in the prefetch list. As will be described later, as the starting point storage position information, the URL of the home page set in the content display device 12, the URL of a prefetch page set in the content display device 12, the URL of a popular Web service, or the like is used. be able to.

When the content display device request processing unit 510 receives from the content display device 12 an HTTP request that includes identification information of the content display device and requests transmission of the prefetch list, the content display device request processing unit 510 reads the identification information of the content display device from the received HTTP request. The content display device request processing unit 510 reads a prefetch list associated with the read identification information of the content display device from the user information storage unit 530 and transmits it to the content display device 12 as an HTTP response. Also, when the content display device request processing unit 510 receives information set on the setting screen from the content display device 12, the content display device request processing unit 510 updates the user information stored in the user information storage unit 530 based on the received information.
The prefetch list generation control unit 540 controls the content access unit 550, the content analysis unit 560, and the prefetch list generation unit 570 to generate a prefetch list. The prefetch list generation control unit 540 reads a URL set as a prefetch target in the content display device from the user information storage unit 530 and outputs the read URL to the content access unit 550 at a predetermined time.

When the URL is output from the prefetch list generation control unit 540, the content access unit 550 generates an HTTP request according to the output URL, transmits the generated HTTP request to the URL, and displays the display data as an HTTP response. Receive. The content access unit 550 associates the received display data with the URL output from the prefetch list generation control unit 540 and outputs the associated data to the content analysis unit 560.
The content analysis unit 560 reads the prefetch list generation rule corresponding to the URL output from the content access unit 550 from the prefetch list generation rule storage unit 580, and the display output from the content access unit 550 according to the read prefetch list generation rule. The URL of the link destination is read from the business data. The content analysis unit 560 associates the read URL with the URL output from the content access unit 550 and outputs the URL to the prefetch list generation unit 570. Details of processing performed by the content analysis unit 560 will be described later.
The prefetch list generation unit 570 generates a prefetch list based on the URL read by the content analysis unit 560 from the display data. The prefetch list generation unit 570 writes the generated prefetch list in the user information storage unit 530 in association with the identification information of the content display device and the URL read from the user information storage unit 530 by the prefetch list generation control unit 540. .
The prefetch list generation rule storage unit 580 stores a prefetch list generation rule that is a rule of processing for reading the URL of the link destination performed by the content analysis unit 560.

FIG. 8 is a diagram illustrating an example of a setting screen displayed on the image display unit 230 by the setting control unit 289 of the content display device 12. In the prefetch list request destination input field P1 in FIG. 6, a transmission destination URL to which the content display device 12 transmits an HTTP request for requesting a prefetch list is input.
In the prefetch time input fields T1 to T4, as in the case of FIG. 4, the time at which the content display device 12 performs prefetching is entered for each homepage and prefetch page. This prefetch time is also the time at which the content display device 12 transmits an HTTP request for requesting a prefetch list to the prefetch information providing server device 52. By setting a prefetch time for each content display device, and for each homepage and prefetch page, an HTTP request for requesting a prefetch list is simultaneously transmitted from each content display device to the prefetch information providing server device. The load on the Internet and the traffic on the Internet 91 are prevented from becoming saturated.
The input fields (A1 to A4, C1 to C3) other than those described above and the timing at which the setting control unit 289 displays the setting screen are the same as in FIG.

FIG. 9 is a data configuration diagram illustrating a data configuration example of an HTTP request in which the content display device 12 requests the prefetch information providing server device 52 to transmit a prefetch list.
In the figure, the GET command on the first line from the top indicates an HTTP request for requesting transmission of a prefetch list. The second line shows the language that the content display device 12 accepts. “Ja” in the figure indicates that the content display device 12 accepts Japanese. The third line is a user agent header defined in the HTTP request. “Tv-browser” is identification information indicating that the HTTP request is transmitted from the content display device. The fourth line shows a server device used by the content display device 12 as a host. The fifth line is authentication information of a user who receives the prefetch information providing service, and includes user identification information (yamada.taro) and information related to a password. This user identification information is also used as identification information of the content display device 12. In this example, Basic authentication, which is the simplest authentication method, is used. However, the present invention is not limited to this, and an authentication method with higher security such as Digest authentication may be used.

FIG. 10 is a data configuration diagram illustrating a data configuration of the prefetch list generated by the prefetch list generation unit 570.
As shown in the figure, the prefetch list is constituted by a sequence of URLs. This URL is a URL of an HTML file of a web page to be prefetched by the content display device 12 or an image file displayed on the web page. “.Html” is used as the extension of the HTML file, and “.jpg” is used as the extension of the image file. The content display device 12 prefetches display data such as an HTML file or an image file in accordance with the prefetch list. The prefetch list generation unit 570 generates a prefetch list for each content display device (for each user identification information) and for each prefetch target homepage or prefetch page.

FIG. 11 is a data configuration diagram illustrating a data configuration example of user information stored in the user information storage unit 530.
In the figure, the first line from the top shows identification information of a user who receives the prefetch information providing service. The second line shows a password used for password authentication of the user when the user updates the user information. The third to eighth lines indicate URLs set as prefetch targets and the capacity of the storage area allocated to these URLs for prefetching.

FIG. 12 is a data configuration diagram illustrating a data configuration example of the prefetch list generation rule.
In the figure, the prefetch list generation rules include URL pattern a1, link destination processing rule a2, link depth rule a3, external domain processing rule a4, HTML file processing rule a5, image file processing rule a6, and prefetching. One of the list import rules a7 is included.
“*” (Asterisk) in the URL pattern a1 is a so-called wild card indicating an arbitrary-length character string. The URL pattern is a key for searching for a prefetch list generation rule to be applied to a prefetch target URL. The content analysis unit 560 searches the generation rules in order from the top, and performs prefetching using the generation rule that matches the URL pattern first.
The link destination processing rule a2 is indicated by “link =...”, And indicates whether or not the link destination page of the web page to be prefetched is to be prefetched. When the link destination processing rule is “yes”, the content analysis unit 560 also sets the link destination page of the prefetch target web page as the prefetch target. On the other hand, when the link destination processing rule a2 is “no”, the link destination page is not a prefetch target. Lines including “* .xml”, “* .rdf”, and “* .rss” are generation rules related to the RSS file, which will be described in the third embodiment. The last line specifies the rule when it does not match any of the other generation rules.

When the link depth rule a3 is indicated by “depth =...” And the link destination processing rule a2 is “yes”, the link depth rule a3 indicates the number of link stages to be prefetched. When the link depth rule is omitted, only one-stage link is a prefetch target.
The external domain processing rule a4 is indicated by “external =...” And indicates whether or not pages in other domains are to be prefetched. When the external domain processing rule is “yes”, pages of other domains are also prefetched. On the other hand, when the external domain processing rule is “no”, only pages with the same domain are prefetched.
The HTML file processing rule a5 is indicated by “html =...” And indicates whether or not the HTML file is to be prefetched. When the HTML file processing rule is “yes”, the HTML file is prefetched. On the other hand, if the HTML file processing rule is “no”, the HTML file is not prefetched.

The image file processing rule a6 is indicated by “image =...” And indicates whether or not an image file included in a prefetch target web page is to be prefetched. When the image file processing rule is “yes”, the image file is a prefetch target. On the other hand, when the image file processing rule is “no”, the image file is not prefetched.
The prefetch list import rule a7 is indicated by “include =...”, And indicates a prefetch list request destination URL when fetching a prefetch list from an external server device. For example, when a website operator generates and publishes a prefetch list, a prefetch list fetch rule is used to fetch the prefetch list. When comfortable access brings benefits to website operators, such as shopping sites, it can be expected that the site operators generate and publish a look-ahead list.

The content analysis unit 560 determines whether the prefetch target URL output from the content access unit 550 matches the URL pattern of the prefetch list generation rule in order from the top of the prefetch list generation rule of FIG. The web page is prefetched according to the prefetch list generation rule determined to match the pattern.
For example, when the prefetch list generation rule r1 is matched, the content analysis unit 560 does not prefetch the linked web page, does not add the URL of the HTML file to the prefetch list, and only adds the URL of the image file to the prefetch list. Add. Therefore, the content analysis unit 560 analyzes display data output from the content access unit 550 in association with the prefetch target URL, and displays a web page such as image data to be pasted on the web page. If the URL of the necessary data storage location is included, the URL is output to the prefetch list generation unit 570 in association with the identification information of the content display device and the prefetch target URL as an element of the prefetch list.
Alternatively, when the prefetch list generation rule r2 is matched, the content analysis unit 560 outputs the URL indicated in the prefetch list import rule to the content access unit 550, which the content access unit 550 acquires and outputs to the content analysis unit 560. The prefetch list to be processed is output to the prefetch list generation unit 570 in association with the identification information of the content display device and the URL to be prefetched.

Alternatively, when the prefetch list generation rule r3 is matched, the content analysis unit 560 analyzes the display data output from the content access unit 550 in association with the prefetch target URL, and is pasted on this web page. Of the linked URLs, those belonging to the same domain as the original URL are read. The content analysis unit 560 outputs the read URL to the content access unit 550 to obtain an HTML file of the linked web page. In the prefetch list generation rule r3, since “depth = 3”, the content analysis unit 560 analyzes the HTML file output from the content access unit 550, and among the link destination URLs pasted on this web page, The URL belonging to the same domain as the URL is read out, and the HTML file of the linked web page is obtained in the same manner as described above. The content analysis unit 560 further acquires an HTML file linked to the acquired web page.
The content analysis unit 560 reads the URL of the storage location of data necessary for displaying the web page, such as image data to be pasted on the web page, from all the acquired HTML files, and reads the read URL as a prefetch target Are associated with the identification information of the content display device and output to the prefetch list generation unit 570.

Next, the operation of the content display device 12 will be described.
Similar to the content display device 11, the content display device 12 has three states: a normal operation state, an automatic execution state, and a standby state. The transition timing between the states and the operation of the content display device 12 in the normal operation state and the standby state are the same as in the case of the content display device 11.
When a signal indicating transition to the automatic execution state is input, the web data acquisition control unit 177 reads the URL set as a prefetch target from the data storage unit 190 as in the case of the first embodiment. And output to the prefetch list request unit 274.
When the URL set as the prefetch target is output from the web data acquisition control unit 177, the prefetch list request unit 274 reads the request destination URL of the prefetch list from the data storage unit 190, and prefetches the URL set as the prefetch target. An HTTP request for requesting the list transmission to the prefetch list request destination URL is generated, and the generated HTTP request is output to the network transmitting / receiving unit 160.

The network transmission / reception unit 160 transmits the HTTP request output from the prefetch list request unit 274 to the prefetch list request destination URL. When receiving an HTTP response that is a prefetch list corresponding to the transmitted HTTP request, the network transmission / reception unit 160 outputs the received prefetch list to the prefetch list request unit 274, and the prefetch list request unit 274 outputs from the network transmission / reception unit 160. The prefetched list thus output is output to the prefetched list analyzing unit 275.
The prefetch list analyzing unit 275 reads the URL to be prefetched from the prefetch list output from the prefetch list requesting unit 274, and outputs the read URL to the web data requesting unit 172-2.

The web data request unit 172-2 generates an HTTP request for requesting display data based on the URL output from the prefetch list analysis unit, and outputs the generated HTTP request to the network transmission / reception unit 160. The network transmission / reception unit 160 transmits the HTTP request output from the web data request unit 172-2 to the URL output from the prefetch list analysis unit. When receiving an HTTP response that is display data corresponding to the transmitted HTTP request, the network transmission / reception unit 160 outputs the received display data to the web data request unit 172-2. The web data request unit 172-2 associates the display data output from the network transmission / reception unit 160 with the URL output from the prefetch list analysis unit and outputs the display data to the web data storage unit 180.
The web data storage unit 180 associates the display data and the URL output from the web data request unit 172-2 and writes them in the data storage unit 190.

When all the URLs read from the prefetch list are output to the web data request unit 172-2, the prefetch list analysis unit 275 outputs a signal indicating that the output of the URL is completed to the web data request unit 172-2. When the web data requesting unit 172-2 outputs a signal indicating that the output of the URL has been completed, the web data requesting unit 172-2 performs the above processing for all the URLs output from the prefetch list analyzing unit 275, and then the processing is completed. A signal indicating this is output to the state management unit 140. When the signal indicating that the processing is completed is output, the state management unit 140 switches the state of the content display device 12 to the standby state. In addition, the state management unit 140 controls the power supply unit 120 to supply power only to the state management unit 140 and the remote control reception unit 130 by outputting a signal indicating transition to the standby state to the power supply unit 120.
The operation when a power-on instruction is input by a user's remote control operation in the automatic execution state is the same as that of the content display device 11.

Next, the operation of the prefetch information providing server device 52 will be described.
The prefetch information providing server device 52 periodically generates a prefetch list using the URL of the home page and the URL of the prefetch page stored in advance for each content display device as starting point storage position information.
Specifically, at a predetermined time, first, the prefetch list generation control unit 540 stores the URL of the home page and the prefetch page stored in advance for each content display device from the user information storage unit 530, The identification information of the content display device is read and output to the content access unit 550.
The content access unit 550 transmits an HTTP request to the content server devices 81 to 83 based on the URL output from the prefetch list generation control unit 540, and receives display data as an HTTP response. The content access unit 550 outputs the received display data to the content analysis unit 560 in association with the URL and the identification information of the content display device output from the prefetch list generation control unit 540.

The content analysis unit 560 reads a prefetch list generation rule from the prefetch list generation rule storage unit 580 based on the URL output from the content access unit 550. In addition, the content analysis unit 560 reads information on the storage capacity allocated to the home page and the prefetch page by the content display device from the user information storage unit 530. The content analysis unit 560 reads URLs such as link destination URLs and image data included in the display data output from the content access unit 550 according to the prefetch list generation rules, and outputs them to the content access unit 550.
The content access unit 550 processes the URL output from the content analysis unit 560 in the same manner as described above, and outputs the URL, display data, and identification information of the content display device to the content analysis unit 560.
The content analysis unit 560 totals the amount of data output from the content access unit 550 for each prefetch target homepage or prefetch page, and compares it with the storage capacity allocated to the homepage and the prefetch page by the content display device. When the total amount of data output from the content access unit 550 is larger than the storage capacity allocated to the home page and the prefetch page by the content display device, the content analysis unit 560 Subsequent URL reading of link destination URL and image data and output to the content access unit 550 are stopped. When the process according to the prefetch list generation rule is completed, the content analysis unit 560 identifies all URLs read from the image data output from the content access unit 550, the URL of the original homepage or prefetch page, and the identification of the content display device. The information is output to the prefetch list generation unit 570 in association with the information.

The prefetch list generation unit 570 generates a prefetch list by collecting the URLs output from the content analysis unit 560 for each homepage or prefetch page.
The prefetch list generation unit 570 writes the generated prefetch list in the user information storage unit 530 in association with the URL set as the prefetch target and the identification information of the content display device.

When the HTTP request for transmitting the prefetch list including the identification information of the content display device and the URL of the home page or the prefetch page is transmitted from the content display device 12, the content display device request processing unit 510 displays the user information storage unit 530. Then, the prefetch list stored in association with the identification information of the content display device 12 and the prefetch target and stored in association with the URL is read, and the read prefetch list is output to the content display device 12 as an HTTP response.
In addition, after the content display device request processing unit 510 receives the HTTP request from the content display device 12, the content access unit 550 performs processing such as transmitting the HTTP request to the content server devices 81 to 83, and the prefetch list. However, it is desirable to generate a prefetch list in advance as described above. This is because when the prefetch information providing server device 52 generates the prefetch list after receiving the HTTP request from the content display device 12, it takes time until the prefetch list is returned to the content display device 12, and the content display is displayed during that time. This is because the device 12 may transition to the normal operation state. Since the content display device 12 does not prefetch the web page in the normal operation state so as not to affect the processing performed in the foreground, the content display device 12 performs the prefetching when transitioning to the normal operation state before receiving the prefetch list. I can't.

As described above, the content display device 12 prefetches the web page in an automatically executed state in which the foreground processing is not performed, as in the case of the content display device 11 of the first embodiment. Data can be acquired at a faster speed. Further, since the content display device 12 itself prefetches the web page, it does not require a communication relay device that prefetches the web page in place of the client device (content display device).
Further, since the content display device 12 performs prefetching of the web page based on the prefetch list generated by the prefetch information providing server device 52, the content display device 12 itself itself, such as hardware resources of the content display device 12 being limited. Thus, even when the prefetch target cannot be determined based on the complex rule, the prefetch can be performed on the prefetch target determined based on the complex rule.
Further, since the prefetch information providing server device 52 generates a prefetch list indicating the prefetch target, when updating the rule for determining the prefetch target, it is only necessary to update the rule stored by the prefetch information providing server device. There is no need to update the display device. Therefore, the rules for determining the prefetch target can be easily updated. For example, by adding a rule that preferentially prefetches the content provided by a specific business operator to the prefetch list generation rule storage unit 580 of 52 of the prefetch information providing server device, the business operator is added to the content display device 12. The provided content can be prefetched preferentially. At that time, there is no need to perform another update on the content display device 12.

In this embodiment, the prefetch information providing server device that generates the prefetch list starting from the URL (of the homepage or the prefetch page) specified by the setting in the content display device 12 has been described. However, the scope of the present invention is as follows. Not limited to this. For example, the prefetch information providing server device 52 may acquire a URL of a popular Web service and generate a prefetch list starting from this URL.
For example, first, the prefetch information providing server device 52 searches the content server devices 81 to 83 to detect a web service whose access frequency or access frequency is equal to or higher than a predetermined threshold, and sets the URL of this web service as popular. Acquired as the URL of the Web service. Alternatively, the content server devices 81 to 83 may transmit this URL to the prefetch information providing server device 52.

  Then, when the prefetch information providing server device 52 generates the prefetch list for the content display device 12, the starting URL (URL of the homepage or prefetch page of the content display device 12) is the above-described popular Web. It is determined whether or not the URL matches the service URL. If it is determined that they match, the prefetch information providing server device 52 does not generate the prefetch list for the content display device 12, and the content display device 12 uses the prefetch list generated from the popular service URL as described above. Prefetch list for Alternatively, when the prefetch information providing server device 52 determines whether or not the starting URL and the URL of the popular Web service belong to the same domain, and determines that they belong to the same domain, for the content display device 12 The prefetch list generated from the URL of a popular service may be used as the prefetch list for the content display device 12 without generating the prefetch list.

In this way, the prefetch information providing server device 52 omits the generation of the prefetch list for each content display device and replaces it with the prefetch list generated in advance, so that the prefetch list is generated according to the setting of the individual content display device 12. Compared to the generation, the generation efficiency of the prefetch list can be improved.
When the prefetch page of the content display device 12 is not set, the prefetch information providing server device 52 provides (transmits) the prefetch list generated from the URL of the popular Web service as the default prefetch list. You may make it do. As a result, even if the URL (URL of the home page or the prefetch page of the content display device 12) that is the starting point for generating the prefetch list is not set, the prefetch information providing server device 52 transmits the prefetch list, and the content display device 12 Prefetching can be performed.

  When a plurality of prefetch information providing server devices are connected to the Internet 91, the prefetch information providing server device 52 transmits not only the prefetch list directly to the content display device 12, but also other prefetch information providing servers. A prefetch list may be transmitted to the apparatus. For example, the prefetch information providing server device 52 transmits the prefetch list generated from the URL of the popular service described above to another prefetch information providing server device. Thus, the prefetch information providing server apparatus that has received the prefetch list does not need to generate a prefetch list starting from the URL of a popular Web service, and the amount of computation of the prefetch information providing server apparatus and the communication load of the Internet 91 are reduced. Can be reduced. Further, the prefetch information providing server device that has received the prefetch list from the prefetch information providing server device 52 generates a prefetch list in which a plurality of prefetch lists are combined into one, and provides the prefetch list to the content display device 12. The list may be generated hierarchically. Thereby, it is possible to distribute the load for the prefetch information providing server device to generate the prefetch list.

<Third Embodiment>
In the third embodiment, as in the case of the second embodiment, the content display device (data display device) 13, the prefetch information providing server device 53, and the content server devices 81 to 83 are connected to the Internet 91.
FIG. 13 is a configuration diagram showing a schematic configuration of the content display device 13 according to the third embodiment of the present invention. In the figure, the content display device 13 includes a content display device main body 102 and a remote controller 110. The content display apparatus main body 102 includes a power supply unit 120, a remote control receiving unit 130, a state management unit 140, a power display unit 150, a network transmission / reception unit 160, a control unit 370, a data storage unit 190, a temporary storage unit 200, and a broadcast reception unit 210. The display selection unit 220, the image display unit 230, and the audio output unit 240 are included. The state management unit 140 includes a timer unit 141. The control unit 370 includes a web data acquisition unit (display data acquisition unit) 371, a web data processing unit (display data processing unit) 379, a VoD data request unit 181, a VoD data conversion unit 186, and a setting control unit 389. Consists of. The web data processing unit 379 includes a web data request unit 372-1, a web data analysis unit 173-1, a web rendering unit 176, and a web data processing control unit 178. The web data acquisition unit 371 includes a web data request unit 372-2, a web data storage unit 180, a prefetch list request unit 374, and a web data acquisition control unit 177.
In the figure, the same reference numerals (110, 120, 130, 140, 150, 160, 173-1, 176, 177, 178, 180, 181, 186, 190, 200, 210, 220, 230, 240) are omitted.

The prefetch list request unit 374 reads the URL of the prefetch list request destination from the data storage unit 190 and generates an HTTP request for requesting transmission of the prefetch list. At that time, the prefetch list request unit 374 generates an HTTP request including information indicating that the content display device 13 is in the automatic execution state and identification information of the content display device 13. The prefetch list request unit 374 transmits the generated HTTP request to the prefetch information providing server device 53 via the network transmission / reception unit 160 and the Internet 91, and acquires a prefetch list described in a program format.
The web data request unit 372-1 performs the same operation as the web data request unit 172-1 in FIG. In addition, if the web data requesting unit 372-1 determines that an RSS file, which will be described later, is designated by the user, the URL of the RSS file is transmitted to the prefetch information providing server device 53 via the network transmitting / receiving unit 160 and the Internet 91. To do.
The web data request unit 372-2 executes the prefetch list described in the program format output from the prefetch list request unit 374 and acquires display data.
The setting control unit 389 displays a setting screen in which the setting item “RSS registration setting” is added to the setting screen displayed by the setting control unit 189 of the content display device 11 on the image display unit 230, and accepts a user setting input. The setting control unit 389 transmits information set on the setting screen to the prefetch information providing server device 53 via the network transmission / reception unit 160 and the Internet 91.

FIG. 14 is a configuration diagram illustrating a schematic configuration of the prefetch information providing server device 53. In the figure, the prefetch information providing server 53 includes a content display device request processing unit 610, a homepage information storage unit 620, a user information storage unit 530, a prefetch list generation control unit 540, a content access unit 550, a content analysis unit 560, and a prefetch. A list generation unit 570 and a prefetch list generation rule storage unit 580 are included. The content display device request processing unit 610 includes a prefetch page conversion unit 690.
In the figure, the same reference numerals (530, 540, 550, 560, 570, 580) are assigned to the portions corresponding to the respective portions in FIG.

The home page information storage unit 620 stores an HTML file of a web page that the content display device 13 displays as a home page.
When receiving the HTTP request from the content display device 13, the content display device request processing unit 610 determines the state of the content display device 13 based on the HTTP request. When it is determined that the content display device 13 is in the normal operation state, the content display device request processing unit 610 reads the HTML file of the web page from the home page information storage unit 620 and transmits it to the content display device 13 as an HTTP response. On the other hand, if it is determined that the content display device 13 is in the automatic execution state, the content display device request processing unit 610 reads the prefetch list associated with the content display device 13 from the user information storage unit 530 and reads the read prefetch. A program including the list is generated and transmitted to the content display device 13 as an HTTP response.
The prefetch page conversion unit 690 reads the prefetch list from the user information storage unit 530, converts it into a program format, and outputs it to the content display device request processing unit 610.

FIG. 15 is a diagram illustrating an example of a setting screen that the setting control unit 389 of the content display device 13 outputs to the image display unit 230.
In the homepage input field A1 in the figure, the URL of the webpage displayed as the homepage is set as in the case of FIG. In this embodiment, this URL is also used as a transmission destination URL of an HTTP request for requesting a prefetch list.
In the RSS registration setting input field RS1, when the user designates an RSS file when the content display device 13 is in the normal operation state, a server device to which the URL of the RSS file is transferred is designated. “RSS” (RDF Site Summery or Rich Site Summary) here is a format that indicates the headline, summary, update information, etc. of the website, and the RSS file is a website headline, summary, This file describes update information. An RSS file may be designated in order to obtain update information of a website in which the user is interested, and the website for which the user designates the RSS file can be expected to be a website that the user often browses. The designation of the RSS file is performed, for example, when the RSS icon is included in the web page displayed by the image display unit 230 and the user selects the RSS icon. For example, the RSS icon is selected when the image display unit 230 displays a cursor on the screen, the user presses the direction button of the remote controller 110 to move the cursor onto the RSS icon, and presses the enter button. Do.

In a normal operation state, when a URL such as “.xml”, “.rdf”, “.rss” is specified by the user, the web data request unit 372 determines that an RSS file has been specified, and this RSS The URL of the file is output to the prefetch information providing server device 53.
For example, when “http://example.org/index.xml” is designated by the user, the web data processing control unit 178 outputs this URL to the web data request unit 372-1. The web data request unit 372-1 detects that the extension of the URL (URL specified by the user) output from the web data processing unit 178 is “.xml”. The web data request unit 372-1 performs a so-called URL encoding process for converting “:” or the like used as a special symbol in a URI (Uniform Resource Identifier) for the specified URL. , Generate the string “http% 3A% 2F% 2Fexample.org% 2Findex.xml”. The web data request unit 372-1 combines the generated character string with the symbol “=” after the URL specified in the input field of the RSS registration setting, and “http://example.com/rss? A URL of “url = http% 3A% 2F% 2Fexample.org% 2Findex.xml” is generated. The web data request unit 372-1 transmits, via the network transmission / reception unit 180 and the Internet 91, an HTTP request that requests the URL indicated by the character string after “=” to be added to the prefetch target for the generated URL. . At this time, in order to indicate that the RSS file has been added to the prefetch target, the prefetch information providing server device 53 displays a message such as “http://example.org/index.xml has been added to the prefetch target”. The included HTTP response may be transmitted to the content display device 13.
This HTTP request is transmitted to the prefetch information providing server device 53 because the head of the URL is “http://example.com/”. When the prefetch information providing server device 53 receives the HTTP request, the prefetch information providing server device 53 performs reverse conversion on the URL after “=” to generate the URL of the RSS file, and sets “http: // example. org / index.xml "is added. Since the URL for generating the prefetch list conforms to the generation rule for the RSS file in FIG. 12, the prefetch list generation rule specified by rss = yes is applied. In this rule, the file of the target URL is first acquired, and the process described in the explanation of FIG. 12 is performed starting from each updated URL described therein.

Note that the prefetch information providing server device 53 may provide an RSS reader service in addition to the generation of the prefetch list. The “RSS reader” here is software that obtains an RSS file and provides update information of a website.
In particular, when the server device that provides the home page of the content display device 13 and the server device that performs the RSS registration setting are the same server device as in the present embodiment, a link to the RSS reader is displayed on the home page. Thus, when the content display device 13 displays a home page, the user can easily operate the RSS reader by selecting a link on the home page. Further, the content display device 13 pre-reads the web page linked from the RSS reader by including the updated URL recorded in the RSS file registered in the RSS reader as a pre-read object by the above method. Can be displayed at high speed.
The other input fields (A2 to A4, T1 to T3, C1 to C3) in FIG. 15 are the same as those in FIG.

  Note that the web data processing unit 379 (FIG. 13) and the content display device request processing unit 610 (FIG. 14) cooperate to pre-read the updated URL described in the RSS file registered in the RSS reader. You may make it perform the process included in object. For example, when “http://example.org/index.xml” is designated by the user, the web data processing unit 379 provides pre-read information for the designated URL via the network transmission / reception unit 160 and the Internet 91. It transmits to the server device 53. When the content display device request processing unit 610 of the prefetch information providing server device 53 receives this URL, the content display device request processing unit 610 determines that the received URL is a URL indicating an RSS file, and this URL is included in the prefetch list stored in the user information storage unit. Add For example, the content display device request processing unit 610 stores in advance a list of RSS files generated by the administrator, and uses this list to determine whether the received URL is a URL indicating an RSS file.

FIG. 16 is a diagram illustrating an example of an HTTP request header that the content display device 13 transmits to the prefetch information providing server device 53 during normal operation.
The user agent header “tv-browser” on the third line does not include “autocruise”, indicating that the HTTP request is transmitted by the content display device in the normal operation state.
Based on the user agent header, the prefetch information providing server device 53 determines that the content display device 13 is in a normal operation state, and displays the web page display data that the content display device 13 displays as a home page as an HTTP response. Transmit to the display device 13.
In FIG. 16, the user identification information shown in FIG. 9 is omitted. By identifying the terminal that has transmitted the HTTP request using the cookie by the prefetch information providing server device 53, the user identification information can be omitted. When the prefetch information providing server device 53 does not use a cookie, the content display device 13 transmits an HTTP request including user identification information, as in the case of FIG.

FIG. 17 is a diagram illustrating an example of an HTTP request header that the content display device 13 transmits to the prefetch information providing server device 53 during automatic execution.
The user agent header “tv-browser-autocruise” on the third line includes “autocruise”, which indicates that the content requesting apparatus in the automatic execution state has transmitted this HTTP request.
Based on this user agent header, the prefetch information providing server device 53 determines that the content display device 13 is in the automatic execution state, and uses the prefetch list for the content display device 13 stored in the user information storage unit 530 as an HTTP response. It transmits to the content display device 13.

FIG. 18 is a diagram illustrating an example of a prefetch list in a program format generated by the prefetch page conversion unit 690.
A list L1 in the figure is a list of URLs of web pages to be prefetched by the content display device 13. The prefetch page conversion unit 690 stores a template of a program for prefetching specified URLs in order in an internal storage unit (not shown). The prefetch page conversion unit 690 generates a program by embedding a prefetch list read from the user information storage unit 530 as an array element in a template stored in advance.
By describing a program for performing prefetching using a programming language that can be processed by a browser such as JavaScript (registered trademark), it is not necessary to newly implement a mechanism for analyzing the prefetch list. Thus, the content display device 13 does not need to include the prefetch list analysis unit 275 included in the content display device 12.
In the content display device 13 that has received the prefetch page, the web data requesting unit 372 sequentially acquires display data based on the prefetch target URL by executing the prefetch page program, and associates it with the URL to cache data. Is written in the data storage unit 190.

Next, the operation of the content display device 13 will be described.
Similar to the content display device 12, the content display device 13 has three states: a normal operation state, an automatic execution state, and a standby state. The transition timing between the states and the operation of the content display device 13 in the standby state are the same as those of the content display device 12.
In the normal operation state, the web data requesting unit 172-1 generates an HTTP request including, for example, “tv-browser” as a user agent header when requesting the display data from the prefetch information providing server device 53, and transmits / receives to / from the network. Output to the unit 160. The network transmitting / receiving unit 160 transmits the HTTP request output from the web data requesting unit 172-1 to the URL of the home page, and receives an HTTP response of display data from the prefetch information providing server device 53. Thereafter, as in the case of the content display device 12, the image display unit 230 displays an image corresponding to the display data received from the prefetch information providing server device 53, and the sound output unit 240 displays the prefetch information providing server device 53. The sound corresponding to the display data received from is output.

When a signal instructing prefetching of a web page is input in the automatic execution state, the prefetch list request unit 374 reads the URL of the prefetch list request destination and the identification information of the content display device from the data storage unit 190. The prefetch list request unit 374 generates an HTTP request for requesting transmission of the prefetch list. The prefetch list request unit 374 generates an HTTP request including identification information of the content display device 13 and a user agent header indicating that the content display device 13 is in an automatic execution state, for example, “tv-browser-autocruise”. That is, by adding “autocruise” to the character string of the user agent in the normal operation state, the automatic execution state is indicated. The prefetch list request unit 374 outputs the generated HTTP request to the network transmission / reception unit 160.
The network transmission / reception unit 160 transmits the HTTP request output from the prefetch list request unit 374 to the prefetch information providing server device 53 based on the URL via the Internet 91. Upon receiving an HTTP response that is a program including a prefetch list corresponding to the transmitted HTTP request, the network transmission / reception unit 160 outputs the received HTTP response to the prefetch list request unit 374, and the prefetch list request unit 374 receives the network transmission / reception unit. The HTTP request output from 160 is output to the web data request unit 372-2.
The web data request unit 372-2 executes the program output from the prefetch list request unit 374, thereby acquiring display data corresponding to each URL of the prefetch list in the program. The web data request unit 372-2 associates the acquired display data with the URL and outputs the associated data to the web data storage unit 180.
The web data storage unit 180 associates the display data output from the web data request unit 372-2 with the URL and outputs the URL to the data storage unit 190.
Of the operations of the content display device 13 in the automatic execution state, the operations other than the above are the same as those of the content display device 12.

Next, the operation of the prefetch information providing server device 53 will be described.
When an HTTP request is transmitted from the content display device 13, the content display device request processing unit 610 determines whether the content display device 13 is in a normal operation state or an automatic execution state based on the user agent header of the HTTP request.
When it is determined that the content display device 13 is in the normal operation state, the content display device request processing unit 610 reads the display data from the homepage information storage unit 620 and uses the read display data as an HTTP response. To send to.
On the other hand, when it is determined that the content display device 13 is in the automatic execution state, the content display device request processing unit 510 sets the identification information of the content display device 13 and the URL set as the prefetch target from the user information storage unit 530. The prefetch list stored in association with each other is read, and the read prefetch list is output to the content display device 13 as an HTTP response.
Thus, when an HTTP request is received from the content display device 13 in the normal operation state, the prefetch information providing server device 53 operates as a content server device that provides the web page, and the HTTP request is received from the content display device 13 in the automatic execution state. Is received, it operates as a server device that provides a prefetch list.
The operation of the prefetch information providing server 53 is the same as that of the prefetch information providing server 52 except for the above.

As described above, the prefetch information providing server device 53 reads the information indicating the state of the content display device 13 from the HTTP request transmitted to the same URL, and includes display data or a prefetch list according to the read information. Since the program is transmitted, the content display device 13 may transmit the display data request and the prefetch list request to the same URL. Therefore, the user of the content display device 13 can save the trouble of setting the request destination URL of the display data and the request destination URL of the prefetch list separately.
Further, the content display device 13 can acquire display data from the URL to be prefetched by executing a program including the prefetch list transmitted by the prefetch information providing server device 53, so there is no need to analyze the prefetch list. It is not necessary to include the prefetch list analysis unit included in the content display device 12 of the second embodiment.

The HTML document of the web page provided by the content server devices 81 to 83 and the prefetch information providing server device 53 includes information indicating the URL to be included in the prefetch list among the URLs of link destinations included in the web page, The information providing server device 53 may generate a prefetch list using this information.
In this case, the content analysis unit 560 reads the link destination URL and information indicating the URL to be included in the prefetch list from the HTML document output from the content access unit 550, and among the read URLs, the read information is prefetched. Only the URL indicating that it should be included in the list is output to the prefetch list generation unit 570.
For example, in the case of a shopping site, a link to an enlarged photograph of a product or a link to a page for explaining the specification of a product is more likely to be accessed than an affiliate advertisement link. Therefore, the creator of the web page provides information indicating the URL of the link that is likely to be accessed as information on the URL to be included in the prefetch list.
As a method for including information indicating the URL to be included in the prefetch list in the HTML document, for example, an extended tag indicating this information may be defined and included in the HTML document using the defined extended tag.
As described above, by including only URLs specified as URLs to be included in the prefetch list among URLs of links pasted on the prefetch target web page, the memory for storing the prefetch results is effectively used. , Can increase the hit rate.

<Fourth Embodiment>
The content display device of the present invention may be used in an environment where it is temporarily impossible to connect to a network, or may be used in an environment where the communication speed changes according to the connected network. . In the present embodiment, an example of such a content display device will be described.
In the fourth embodiment, the content display device (data display device) 14 is a mobile that can be connected to a LAN 92 and a third generation mobile phone communication network (hereinafter referred to as “3G network”) 93 by wireless communication. Type content display device. Further, the Internet 91 can be accessed via either the LAN 92 or the 3G network 93. As in the second embodiment, the prefetch information providing server device 53 and the content server devices 81 to 83 are connected to the Internet 91.

FIG. 19 is a configuration diagram showing a schematic configuration of the content display device 14 according to the fourth embodiment of the present invention. In the figure, the content display device 14 includes a battery 151, a battery control unit 152, a power supply unit 153, a touch panel unit 131, a state management unit 140, a power display unit 150, a wireless communication unit 161, a control unit 370, and a data storage unit 190. A temporary storage unit 200, a broadcast receiving unit 210, a display selection unit 220, an image display unit 230, and an audio output unit 240. The state management unit 140 includes a timer unit 141. The control unit 370 includes a web data acquisition unit (display data acquisition unit) 371, a web data processing unit (display data processing unit) 379, a VoD data request unit 181, a VoD data conversion unit 186, and a setting control unit 389. Consists of. The web data processing unit 379 includes a web data request unit 372-1, a web data analysis unit 173-1, a web rendering unit 176, and a web data processing control unit 178. The web data acquisition unit 371 includes a web data request unit 372-2, a web data storage unit 180, a prefetch list request unit 374, and a web data acquisition control unit 177.
In the figure, the same reference numerals (140, 141, 150, 370, 371, 372-2, 374, 177, 180, 379, 372-1, 173-1, 176, and 178, 181, 186, 389, 190, 200, 210, 240), and the description is omitted.
The content display device 14 includes a touch panel unit 131 instead of the remote control 100 and the remote control reception unit 130, a battery 151, a battery control unit 152, and a power supply unit 153 instead of the power supply unit 120, and It differs from the content display device 13 (FIG. 13) in that a wireless communication unit 161 is provided instead of the network transmission / reception unit 160.

The battery 151 is a secondary battery such as a lithium ion battery, accumulates electric power supplied from the outside of the content display device 14, and supplies electric power to each unit of the content display device 14 according to the control of the battery control unit 152.
The power supply unit 153 includes a power receiving terminal and outputs the received power to the battery 151 when receiving power from outside the content display device 14.
The battery control unit 152 controls the power supply of the battery 151 based on the state of the power supply unit 153, the state of the battery 151, and the operation status of each unit of the content display device 14.

The touch panel unit 131 includes a touch panel (touch position detection device) on the display screen of the image display unit 230, and detects a touch position on the display screen when the user performs a touch operation on the display screen. Then, the touch panel unit 131 determines the user operation content based on the touch position or the change in the touch position, and outputs the determination result to the control unit 470, the display selection unit 220, or the broadcast reception unit 210.
For example, when a button for selecting a TV broadcast channel is displayed on the display screen and any one of the buttons is touched, the touch panel unit 131 determines the selected channel and receives the broadcast. To the unit 210. When any button (image) is touched while a button for selecting content to be displayed such as a television broadcast or a web page is displayed on the display screen, the touch panel unit 131 displays the selected content. Is output to the control unit 370 and the display selection unit 220.

For example, the data storage unit 190 stores the selection screen data in the form of web screen data in advance, and the control unit 370 causes the image display unit 230 to display these selection screens in response to a display request operation by the user. . As the operation for requesting the display of the selection screen by the user, for example, an operation in which the user moves a finger on the display screen can be used. Specifically, when the touch panel unit 131 detects that the touch position has changed at a predetermined speed or higher, the touch panel unit 131 switches the screen to be displayed based on the change direction of the touch position (the current screen is switched to a new display). Information indicating the screen to be displayed is output to the control unit 370. Alternatively, the content display device 14 may include a selection screen display button, or may display a selection screen display button on the display screen.
Note that various types of touch panels can be used as the touch panel included in the touch panel unit 131. For example, an ultrasonic method, an infrared method, or a capacitance method may be used.

  The wireless communication unit 161 is connected to the LAN 92 by performing wireless communication with an access point (for example, a wireless LAN base unit) of the LAN 92 and transmits / receives a signal to / from the LAN 92. The wireless communication unit 161 connects to the 3G network 93 by performing wireless communication with an access point (for example, a mobile phone base station) of the 3G network 93 and transmits / receives signals to / from the 3G network 93. Further, the wireless communication unit 16 can be connected to the Internet 91 via the network regardless of whether the wireless communication unit 16 is connected to the LAN 92 or the 3G network 93.

As described above, the content display device 14 can operate without receiving power from the outside by including the battery 151, and can be connected to the network without a wired connection with the outside by including the wireless communication unit 161. By being provided with the touch panel unit 131, the portable device can be operated in various postures such as a standing state.
In addition, each part of the content display apparatus 14 can be provided with a function suitable for a portable device, such as the broadcast receiving unit 210 having a one-segment reception function.

FIG. 20 is a diagram illustrating state transition of the content display device 14.
As shown in the figure, the content display device 14 takes one of a standby state, an automatic execution state when the power is turned off, a normal operation state, an automatic execution state when no operation is performed, and a CPU stopped state.
The normal operation state is the same as the normal operation state of FIG. 2, and the content display device 14 displays various contents in response to a user request. The standby state is the same as the standby state of FIG. 2, and the content display device 14 waits for a trigger for performing state transition.
The automatic execution state when the power is turned off is the same as the automatic execution state of FIG. 2, and the content display device 14 prefetches a web page designated in advance by the user and acquires display data. Note that the network to be connected for prefetching will be described later. Even in the no-operation automatic execution state, the content display device 14 prefetches a web page designated in advance by the user and acquires display data. As will be described later, the state transition method differs between the automatic execution state when the power is turned off and the automatic execution state when there is no operation.

In the CPU stopped state, the content display device 14 stops the CPU (control unit 370). Specifically, the battery control unit 152 performs control such as clock supply stop (clock gating) and power supply stop (power gating) to the CPU to reduce power consumption.
In portable devices, the driving time by a battery (the time that can be operated without charging) is often important. Therefore, the content display device 14 shifts to the CPU stopped state to reduce power consumption, thereby extending the driving time by the battery. In general, the CPU often consumes power after the screen display unit. Therefore, a large power saving effect can be expected by stopping the CPU.
In the CPU stop state, the battery control unit 152 stops the CPU while the screen display unit 230 holds the display of a still screen (a screen without motion such as a still image or text). By performing such control, it is possible to suppress power consumption and heat generation while providing information displayed on the image display unit 230 to the user.

The stop of the CPU is particularly effective when the content display device 14 is an electronic book terminal, for example. In the electronic book terminal, it takes a long time for the user to read the time displayed on the screen, and a large power saving effect can be expected by stopping the CPU during this time.
In addition, in order to detect a user operation in the CPU stop state, the battery control unit 152 periodically releases the CPU stop state for only a short period, and the CPU (control unit 370) determines whether or not there is a user operation during this period. . Specifically, for example, the control unit 370 inquires of the touch panel whether there is a user operation (polling). Alternatively, the content display device 14 includes a sub CPU with low power consumption that monitors the state of the touch panel and the switch, and the battery control unit 152 supplies the clock and power to the CPU by an interrupt signal from the sub CPU. You may make it use methods other than the above, such as restarting.

The state transition between the normal operation state, the automatic execution state when the power is turned off, and the standby state is the same as described in FIG. When the power-off operation is performed in the normal operation state, the content display device 14 transitions to the automatic execution state when the power is off. In the automatic execution state when the power is turned off, a transition is made to the normal operation state when a power-on operation is performed, and a transition to the standby state is made when prefetching is completed with the power turned off. In the standby state, when a power-on operation is performed, the state transits to a normal operation state, and when a predetermined trigger is detected while the power is off, the state transitions to a power-off automatic execution state.
Further, in a normal operation state, when there is no user operation and no moving image display, and the state in which the CPU does not perform processing for content display continues for a predetermined time, the content display device 14 transitions to the no-operation automatic execution state. Then, prefetch processing is performed.
In addition, when it is detected that some user operation has been performed in the no-operation automatic execution state, the content display device 14 transitions to a normal operation. On the other hand, in the no-operation automatic execution state, when the prefetching process is completed without any user operation, the content display device 14 transitions to the CPU stop state.
When it is detected that some user operation is performed in the CPU stopped state, the content display device 14 transitions to a normal operation.

In this way, by transitioning to the no-operation automatic execution state in a state where there is no user operation and operation display, the content display device 14 executes the prefetching process without affecting the process related to the user operation. Thereby, it is possible to avoid giving stress to the user in that the response to the user operation is not delayed due to an increase in CPU load due to the prefetching process.
In the automatic execution state when no operation is performed, the content display device 14 communicates by connecting to the LAN 92 or the 3G network 93. At this time, when an indicator indicating that communication is being performed is displayed on the screen, only the display of this indicator may change, and the display of other parts may not change. In this case, the battery control unit 152 may reduce power consumption by supplying power only to a portion of the display screen where the display changes. For example, the image display unit 230 includes a display device (display screen) that holds a display such as a ferroelectric liquid crystal or a microcapsule electronic paper, and the battery control unit 152 includes the display device. Energize only the part of the display to be updated.

Next, the validity determination of display data will be described with reference to FIG.
FIG. 21 is a flowchart illustrating a processing procedure in which the web data request unit 372-1 and the web data request unit 372-2 acquire display data. Hereinafter, the process performed by the web data request unit 372-1 will be described, but the process performed by the web data request unit 372-2 is the same.
As described in the first embodiment, the web data request unit 372-1 determines the validity of the display data based on the display data acquisition time stored in the data storage unit 190. Moreover, in this embodiment, the web data request | requirement part 372-1 processes by the process sequence which can respond to an offline state (state which is not connected to a network).

  In step S1001, the web data request unit 372-1 determines whether or not the display data to be acquired has been prefetched, that is, whether or not the data storage unit 190 has stored the display data to be acquired. . When it is determined that the display data is not prefetched (step S1001: no prefetching), the process proceeds to step S1007 to determine the line state. On the other hand, when it is determined that the display data is pre-read (step S1001: pre-read), the process proceeds to step S1002 to determine the valid period.

  In step S1002, the web data request unit 372-1 determines whether the display data stored in the storage unit 190 is within the expiration date. Specifically, the data storage unit 190 stores the pre-read display data, the acquisition destination URL, and the expiration date information in association with each other. Then, the web data request unit compares the expiration date information with the current time (the time when the web data request 372-1 determines the validity of the display data) to determine whether the display data is valid. Determine whether or not.

Here, for example, the max-age directive (Directive) of the cache control header (Cache-Control header) is used to store the validity information.
The max-age directive is an item in an HTTP header (HTTP Header) used for a technique called cache control, and stores the expiration date of content.
When a relay server (proxy server) receives an acquisition request (request) of content temporarily stored in its own cache, the cache control sends back the temporarily stored content (response), or This is a technique for determining whether to re-acquire content from an original server and send it back. The max-age directive stores the maximum expiration date of the content, and the relay server compares this maximum expiration date with the current time (the time when the determination is made) and if it is within the expiration date, The temporarily stored content is returned, and if the expiration date has expired, the content is acquired again from the original server and returned.

  The web data requesting unit 372-1 also uses the same technique to determine whether or not the display data stored in the data storage unit 190 is within the expiration date. If it is determined that the data is within the expiration date, the data storage unit The display data is read from 190 and used, and if it is determined that the expiration date has expired, the display data is acquired from the network 92 via the wireless communication unit 161.

If it is determined in step S1002 that the display data is within the expiration date (step S1002: within the expiration date), the web data requesting unit 372-1 determines that the display data stored in the data storage unit 190 is valid. The process proceeds to step S1011 and reads display data from the data storage unit 190.
On the other hand, if it is determined in step S1002 that the expiration date has passed (step S1002: expired), the web data request unit 372-1 proceeds to step S1003 and determines whether the line state of the content display device is online or offline. To do. If it is determined that the user is offline (step S1003: offline), the process proceeds to step S1008 to perform error processing. On the other hand, if it is determined to be online (step S1003: online), the process proceeds to step S1004.

In step S1004, the web data request unit 372-1 determines whether or not the data is updated in the server.
For example, the web data request unit 372-1 stores the display data acquisition time stored in the storage unit 190 in the If-Modified-Since header, and the server indicated by the URL stored in association with the display data. The request is transmitted via the wireless communication unit 161.
This If-Modified-Since header is a kind of HTTP header, and the server requests a reply (reply) as to whether data has been updated after the time specified by the If-Modified-Since header. If the data has not been updated, the server returns a status of 304. On the other hand, if the data has been updated, the server returns the status 200 and the updated display data.

When it is determined in step S1004 that the data has been updated (for example, when the status of No. 200 is acquired; step S1004: updated), the web data request unit 372-1 sends the updated display data to the server. (Step S1005). For example, the web data request unit 372-1 acquires display table data transmitted from the server together with the 200th status via the wireless communication unit 161.
Then, the web data request unit 372-1 writes the acquired display data in the web data storage unit 190 (step S1006). Further, the web data request unit 372-1 outputs the acquired display data to the web data analysis unit 173-1 (step S1021).
Thereafter, the processing in FIG.

On the other hand, when it is determined in step S1004 that the data has not been updated (for example, when the status 304 is acquired; step S1004: no update), the web data request unit 372-1 stores the data in the data storage unit 190. It is determined that the data to be processed is valid, and the data is read from the data storage unit 190 (step S1011).
And it progresses to step S1021 and outputs the read data to the web data analysis part 173-1.

In step S1007, the web data request unit 372-1 determines whether the state of the content display device is online or offline. If it is determined to be online (step S1007: online), the process proceeds to step S1005 to acquire display data. On the other hand, if it is determined that the user is offline (step S1007: offline), error processing is performed assuming that the display data cannot be acquired (step S1008).
As the error processing, for example, the web data requesting unit 372-1 outputs the error message display data to the web data analyzing unit 173-1 so that an error message is displayed in a portion where the display data could not be acquired.
Thereafter, the processing in FIG.

Note that even if there is a possibility that the data is old, there is a case where it is advantageous for the user to display the pre-read data rather than performing error processing. For example, in the case of a news list display screen, if a screen display is performed using old display data, a constant news can be provided even if the latest news cannot be displayed.
In such a case, instead of error processing, pre-read display data (data stored in the data storage unit 190) may be displayed.

FIG. 22 is a flowchart showing the processing procedure of the web data requesting unit 372-1 when displaying pre-read display data instead of error processing.
If it is determined in step S1001 that there is prefetching (step S1001: prefetching), the web data requesting unit 372-1 checks the line state prior to determining the expiration date (step S1003 ').
When it is determined that it is offline (step S1003 ′: offline), the web data request unit 372-1 reads the display data from the data storage unit regardless of the expiration date of the display data (step S1011), and the web The data is output to the data analysis unit 173-1 (step S1021), and the process of FIG.
Thereby, although there is a possibility that the data is not the latest data, the pre-read data can be displayed instead of the error processing.

On the other hand, when it is determined to be online (step S1003 ′: online), the web data request unit 372-1 determines the expiration date as described in step S1002 of FIG. 21, and is within the expiration date. If it is determined (step S1002 ′: within the time limit), the process proceeds to step S1011. If it is determined that the valid period has expired (step S1002 ′: expired), the process proceeds to step S1003.
Steps S1004 and subsequent steps are the same as described in FIG.

Even when the line status is online, if the communication speed is slow, it is preferable to display the prefetched data at a high speed even if it is a little older than it takes time to display the latest data and stress the user. It is possible. In such a case, in step S1003 ′ of FIG. 22, when the communication speed is equal to or lower than the predetermined speed, the web data requesting unit 372-1 may determine that it is offline. Alternatively, based on the type of display data and the amount of data, the time required for obtaining the display data may be estimated, and when it is estimated that a predetermined time or more is necessary, it may be determined that the user is offline.
Thereby, it is possible to display at high speed and reduce the stress of the user.

Further, when the web data processing unit 379 serves to generate an image embedded in a part of an application instead of a simple web browser, the web data request unit 372-1 has an error other than displaying an error message. Processing may be performed.
FIG. 23 is a diagram illustrating an example of a display screen when performing error processing other than displaying an error message. FIG. 5A shows an example of a display screen when the content display device 14 that executes an application and displays an application image has successfully displayed data and does not require error processing.

In the figure, an area A101 is a system background image display area for displaying a background image for an application image. On the other hand, an application image is composed of the areas A102, A103, A104, and A105. An area A102 is an application title display area that displays the title name of the application being executed by the content display device 14. An area A103 is an application screen area that displays application data and a background image. Area A104 is an area for displaying one display data. An area 105 is an area for displaying advertisement data, which is another display data.
In FIG. 23A, the content display device 14 succeeds in obtaining display data (advertisement data) to be displayed in the area A104 and the area A105 and performs the display, so there is no need to perform error processing.

On the other hand, in FIG. 23B, the content display device 14 succeeds in obtaining the display data to be displayed in the area A104, but fails to obtain the advertisement data to be displayed in the area A105, and can display the area A105. Not. Therefore, the content display device 14 (web data request unit 372-1) performs error processing for displaying the application screen area A113 widely instead of displaying the area A105.
In FIG. 23 (c), the content display device 14 fails to acquire any of the display table data displayed in the area A104 and the advertisement data displayed in the area A105, and can display the areas A104 and A105. Not. Therefore, the content display device 14 (web data request unit 372-1) performs error processing for displaying the system background image display area A121 widely instead of displaying the areas A104 and A105.

As described above, since the content display device 14 pre-reads display data and stores it in the data storage unit 190, it can perform screen display even in an offline state.
For example, if the content display device that communicates with the wireless LAN base unit does not perform prefetching, the display data cannot be acquired and the display based on the display data cannot be performed when the content display device cannot be connected to the network away from the base unit. . On the other hand, since the content display device 14 pre-reads the display data in advance, it can display the screen using the pre-read display data even in a state where it cannot be connected to the network away from the parent device. .
Moreover, as shown in FIG. 20, the content display device 14 performs prefetching in a state that does not affect the screen display or user operation, such as the automatic execution state when the power is turned off or the automatic execution state when there is no operation. Therefore, it is possible to avoid a situation in which the operation of the content display device 14 is delayed and stress is given to the user.

Even if it can be connected to the network, if the communication speed is low, it takes a long time to acquire and display the display data. In such a case as well, as in the offline case, the content display device 14 can display the screen at high speed by prefetching.
For example, when acquiring data by connecting to the Internet 91 via the 3G network 93, the communication speed is usually slower than when acquiring data by connecting to the Internet 91 via the LAN 92, and the screen display may take a long time. There is. In such a case, the screen can be displayed at a higher speed by prefetching in advance.
Also in this case, as shown in FIG. 20, the content display device 14 performs prefetching in a state that does not affect the screen display or the user operation, such as the automatic execution state when the power is turned off or the automatic execution state when there is no operation. Therefore, it is possible to avoid a situation in which the operation of the content display device 14 is delayed due to prefetching and stresses the user.

Furthermore, if the content display device can be connected to multiple networks and the fee structure varies depending on the connection destination, pre-reading when connecting to a network with a low communication fee reduces the communication fee. be able to.
For example, when the access to the wireless LAN 92 is fixed charge and the access to the 3G network 93 is pay-per-use, the content display device 14 connects to the Internet 91 via the wireless LAN 92 when the wireless LAN 92 is accessible. Read ahead and store display data. Then, when a homepage display request on the Internet 91 is requested by a user operation in a state in which only the 3G network 93 can be connected, instead of accessing the Internet 91 via the 3G network 93, it is pre-read. The home page requested to be displayed is displayed using the display data. Thereby, the connection time to the 3G network can be shortened, and the communication fee can be suppressed.
Also in this case, as shown in FIG. 20, the content display device 14 performs prefetching in a state that does not affect screen display or user operation, such as an automatic execution state when the power is turned off or an automatic execution state when no operation is performed. Therefore, it is possible to avoid a situation in which the operation of the content display device 14 is delayed due to prefetching and stresses the user.

Note that advertisements can also be displayed offline when prefetched.
Hereinafter, the advertisement display in the offline state will be described by taking the case where the content display device 14 displays the advertisement as an example.
In general, as the number of display opportunities increases, the effect of the advertisement increases. Therefore, it is desirable that the advertisement can be displayed not only when the content display device is online but also when it is offline. Therefore, the content display device 14 prefetches display data necessary for displaying an advertisement. Thereby, an advertisement can be displayed even when offline. For example, the content display apparatus 14 uses the prefetch list to prefetch display data corresponding to an advertisement and metadata specifying an action that occurs when the advertisement is selected.
As an advertisement selection method, a method of selecting an advertisement displayed on a part of a web page or the like (for example, selecting by touching an advertisement displayed on a part of a web page) or the content display device 14 ( The web data processing unit 379) has a function of displaying an advertisement on a part of the screen, and a method for selecting the advertisement displayed on the part of the screen can be used.
In addition, as a typical operation of the content display device 14 when the user is interested in an advertisement and selects the advertisement, it is conceivable to display a homepage with a URL associated with the selected advertisement in advance. In this case, as an operation of the content display device 14 when an advertisement is selected offline, for example, the following can be considered.

  As a first operation, the content display device 14 may display a page specified by selection of an advertisement, as in the online mode, using the pre-read display data. In this operation, since the specified page is displayed while being offline, the page is displayed if the page is prefetched, and an error occurs if the page is not prefetched.

  As a second operation, the content display device 14 may be automatically switched online (accessed to the network) and instructed to display a designated page. The page is displayed when prefetched or when switched to online. On the other hand, if the designated page is not prefetched and the content display device 14 is out of the wireless LAN range and cannot be switched online, an error occurs. When switched to online, the specified page is displayed regardless of whether or not prefetching is performed. If prefetching is performed, high-speed display can be expected.

  As a third operation, when a page that has not been prefetched is to be displayed, an alternative image may be displayed without displaying an error. That is, if the designated page is prefetched, the designated page is displayed. If the designated page is not prefetched, a substitute image is displayed.

  Note that the method of switching the display by selecting the advertisement image may be combined with the second operation described above. In this case, the content display device 14 displays the designated page when pre-reading the designated page (the page associated with the selected advertisement) or when switching to online. . On the other hand, if the designated page is not prefetched and the content display device 14 is located outside the range of the wireless LAN and cannot be switched online, a substitute image is displayed. When switched to online, the content display device 14 displays the designated page regardless of whether or not prefetching is performed. If the specified page is prefetched, high speed display can be expected.

Here, regarding a method for the content display device 14 to acquire display data for a substitute image, a general system for displaying an Internet advertisement does not provide a mechanism for displaying a substitute image. For this reason, in order to distribute the advertisement image display data and the substitute image display data separately, it is necessary to provide a new mechanism for distributing the substitute image display data. Needs to be modified.
Therefore, the server device that distributes the advertisement may distribute the display data for advertisement and the display data for substitute image together.
Hereinafter, a description will be given of a case in which an advertisement is displayed in the area A105 in FIG. The content display device 14 displays an image of “XX electric appliances for home appliances” as an advertisement in the area A105, and displays a larger alternative image including a television picture in response to a user operation interested in the advertisement. .
FIG. 24 is a diagram illustrating a screen display example including an advertisement image and a substitute image. Regions A101 and A102 in the figure are the same as regions A101 and A102 in FIG.
The area A205 is an area for displaying a selection advertisement image, and the area A203 is an area for displaying a substitute image as an action when the selection advertisement image (area A205) is selected. An area A203 corresponds to the application screen area A103 in FIG. 23, and displays application data and a background image before a selection advertisement image is selected. On the other hand, when an advertisement image for selection is selected by a user operation such as a mouse click, an alternative image for advertisement is displayed as shown in FIG. The area A204 is an area that is not used.

Here, the advertisement occupies most of the screen, and if the display related to the function used by the user is reduced, the user's convenience is impaired and a bad impression on the advertisement is given to the user. On the other hand, the user feels that he wants to know more information about the advertisement he is interested in, even if he is offline.
Therefore, in this embodiment, as described above, an advertisement is displayed in a relatively narrow area (area A205) on the screen, and a substitute image (area A203) is provided only to a user who is interested in the advertisement. Thus, it is possible to obtain an effect of achieving both user convenience and advertising effect.
Furthermore, when the server distributes one image and one URL corresponding to one advertisement, the content display device 14 can display the screen of FIG. In other words, the screen display can be performed with a mechanism equivalent to that of the conventional Internet advertisement, so there is no need to drastically modify the server that distributes the advertisement, and the operation cost can be reduced. No special modification is required, and software with a relatively simple structure can be used.

Note that the content display device 14 may display a larger image including the advertisement image in accordance with the advertisement selection operation by the user.
25 and 26 are diagrams illustrating display examples of larger images including advertisement images. Regions A101 and A102 in the figure are the same as regions A101 and A102 in FIG.
An area A305 is an area for displaying a selection advertisement image. An area 303 corresponds to the application screen area A103 in FIG. 23, and displays application data and a background image before a selection advertisement image (area A305) is selected. The area A304 is an area that is not used before the selection advertisement image (area A305) is selected, like the area A204 in FIG.
When the area A305 is selected by a user operation such as a mouse click, the content display apparatus 14 displays one substitute image including the areas A303, A304, and A305 in the area as shown in FIG. .

For example, the content display device 14 stores in advance one substitute image including the areas A303, A304, and A305, and displays a portion corresponding to the area 305 in the substitute images. When the area 305 is selected by a user operation, the entire substitute image is displayed.
As described above, the content display device 14 stores the images to be displayed in each area as a group, thereby simplifying the management of the images.

Alternatively, as shown in FIG. 26, the content display device 14 may display one substitute image on the entire screen. In the figure, an area A315 corresponds to the area A305 in FIG. 25, and is an area for displaying a selection advertisement image. The area A313 corresponds to the area A303 in FIG. 25, and displays application data and a background image before the selection advertisement image (area A315) is selected. The area A314 is an area that is not used before the selection advertisement image (area A315) is selected, like the area A304 in FIG.
When the area A315 is selected by a user operation such as a mouse click, the content display device 14 displays one substitute image including the areas A313, A314, and A315 on the entire display screen as shown in FIG. To do.

  In addition, when the offline state of the content display device 14 continues and prefetching cannot be performed, there may be a case where there is no effective display data for advertisement due to expiration. Here, in many cases, advertisement is not essential for the user. Therefore, when there is no display data for effective advertisement, the content display device 14 does not need to display an error at a position where the advertisement should be displayed, and does not display the advertisement as described in FIG. Alternatively, a very small image may be displayed instead to control substantially no advertisement. Or, as another display method when the advertisement is expired, display the image by reducing the saturation of the image to indicate that the pre-read data (advertisement) is old, or changing the display to sepia. The method may be used.

  In order to operate when an advertisement is selected, the content display device 14 may store and execute an application or script in which an appropriate operation is described including offline. Here, complicated operations could not be described in a web page before HTML 4.01. For this reason, it has been difficult for the content display device 14 to perform complicated processing in response to a user operation on the web page in an offline state in which no server support is available. On the other hand, complex operations can be described in HTML 5 web pages, scripts and applications using Flash (registered trademark) and Java (registered trademark). By using these scripts and applications, it is possible to cause the content display device 14 to perform complicated operations in response to user operations. For example, it is possible to perform flexible processing such as proceeding with the purchase procedure in an offline state and automatically performing final approval processing when the online state is entered.

  When generating a prefetch list that assumes an advertisement, it is important to generate a prefetch list that causes the content display device to prefetch advertisements that the user may be interested in. In this regard, an advertisement that the user will be interested in may be selected using a technique called targeting advertisement. Alternatively, an information source unique to the content prefetching apparatus to which the present invention is applied can be used. For example, as described above, the RSS (starting point storage position information) registered as RSS or the prefetching starting point is a large information source for knowing the user's interest. In addition to this, a content ID such as content (moving image, electronic book data) recorded in the content display device may be used. For example, the content display device may prefetch a recorded movie or novel sequel advertisement. In addition, the information on the store where the content display device is sold and the model name of the content display device itself can also be information for knowing the user's interest. For example, the content display device may prefetch an advertisement relating to a store where the content display device is sold. In addition, when the position information of the content display device can be obtained, the content display device may preferentially display an advertisement of a nearby store. When information about a store that provides a public wireless LAN that is being used can be obtained, the content display device may preferentially display the store advertisement.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

  Hereinafter, various aspects of the present invention will be described as supplementary notes.

  (Supplementary note 1) A data display device that performs prefetching of a web page in an automatic execution state in which a foreground process is not performed.

  (Additional remark 2) It has a prefetch list production | generation part which produces | generates the prefetch list | wrist which shows the web page of the prefetch object by a content display apparatus, and the request processing part which transmits the said prefetch list according to the transmission request | requirement of the said prefetch list A prefetch information providing server device characterized by the above.

  (Additional remark 3) The said request process part transmits the display data or the said prefetch list according to the state of the content display apparatus of the transmission source of the transmission request of the said prefetch list, The prefetch as described in Additional remark 2 characterized by the above-mentioned. Information providing server device.

  (Additional remark 4) The content display apparatus characterized by memorize | storing the image which put together the advertisement part and the image displayed when an advertisement is selected into one.

  The present invention is suitable for use in data display devices and server devices.

1, 2 Content display system 11, 12, 13, 14 Content display device 52, 53 Prefetch information providing server device 81, 82, 83 Content server device 91 Internet 92 LAN
93 3G network 100, 101, 102 Content display device main body 110 Remote control 120 Power supply unit 130 Remote control reception unit 131 Touch panel 140 Status management unit 141 Timer unit 150 Power supply display unit 151 Battery 152 Battery control unit 153 Power supply unit 160 Network transmission / reception unit 170, 270, 370 Control unit 190 Data storage unit 200 Temporary storage unit 210 Broadcast reception unit 220 Display selection unit 230 Image display unit 240 Audio output unit 510, 610 Content display device request processing unit 530 User information storage unit 540 Prefetch list generation control unit 550 Content access unit 560 Content analysis unit 570 Prefetch list generation unit 580 Prefetch list generation rule storage unit 620 Homepage information storage unit 690 Prefetch page conversion unit

Claims (16)

An image display unit for displaying an image;
A display data storage unit for storing display data indicating an image displayed by the image display unit;
A state management unit;
The storage position information indicating the storage position of the display data on the network is acquired, the display data is acquired based on the acquired storage position information, and the acquired display data is associated with the storage position information and the display A display data acquisition unit for writing to the data storage unit;
Comprising
When the predetermined event occurs, the state management unit determines a state after the state transition based on the occurrence of the event, and when determining that the state is a predetermined state, the display data acquisition unit The storage position information indicating the storage position of the display data on the network is acquired, the display data is acquired based on the acquired storage position information, and the acquired display data is associated with the storage position information and the display A data display device that is controlled to be written in a data storage unit for use. An image display unit for displaying an image;
A display data storage unit for storing display data indicating an image displayed by the image display unit;
A power supply unit for supplying power to each unit;
A state management unit that controls whether the power supply unit supplies power to the image display unit;
The storage position information indicating the storage position of the display data on the network is acquired, the display data is acquired based on the acquired storage position information, and the acquired display data is associated with the storage position information and the display A display data acquisition unit for writing to the data storage unit;
When storage position information is input while the state management unit is controlling the power supply unit so as to supply power to the image display unit, the storage position information input to the display data storage unit and It is determined whether or not display data is stored in association with each other. If it is determined that the display data is stored, the display data stored in association with the input storage position information is read and read. A display data processing unit that causes the image display unit to display an image based on the display data;
Comprising
When a predetermined event occurs, the state management unit determines a state after state transition based on the occurrence of the event, and determines that the power supply unit is in a state of not supplying power to the image display unit The display data acquisition unit acquires storage position information indicating a storage position of the display data on the network, acquires display data based on the acquired storage position information, and acquires the display data The data display device is controlled so as to be written in the display data storage unit in association with the storage position information. The state management unit controls the power supply unit to supply power to the image display unit when a power-on instruction is input, and the display data acquisition unit acquires the display data The data display device according to claim 2, wherein control is performed to stop acquisition of the display data. The data display according to claim 2 or 3, wherein the predetermined event includes an input of a power-off instruction instructing the power supply unit not to supply power to the image display unit. apparatus. A storage position information storage unit for storing storage position information indicating a storage position of display data on the network;
5. The data display device according to claim 2, wherein the display data acquisition unit acquires the storage position information from the storage position information storage unit. 6.   5. The display data acquisition unit according to claim 2, wherein the display data acquisition unit requests the server device connected to the network to transmit the storage location information to acquire the storage location information. The data display device described.   The display data acquisition unit transmits information indicating that the power supply unit is not supplying power to the image display unit to the server device and requests transmission of the storage location information. The data display device according to claim 6.   The said display data acquisition part acquires the program including the said storage location information from the said server apparatus, and acquires the said display data by running the acquired program, The Claim 6 or Claim 7 characterized by the above-mentioned. The data display device described in 1.   When the display data processing unit determines that storage location information of an RSS file, which is a file indicating display data location information, is input, the display data processing unit transmits the input storage location information to the server device. The data display device according to any one of claims 6 to 8. A server device that transmits a list of storage location information of display data to a data display device or another server device,
A display data acquisition unit for acquiring the display data indicated by the starting point storage position information based on starting point storage position information indicating display data serving as a starting point for searching the network for storage position information to be included in the list; ,
A display data analysis unit for reading storage position information of display data associated with the display data from the acquired display data;
A list generation unit that generates the list including the read storage location information;
A request processing unit configured to transmit the list to the data display device or the other server device that has transmitted the transmission request when receiving the transmission request for the list from the data display device or the other server device. A server device characterized by A display data storage unit for storing display data;
When the request processing unit receives the transmission request including information indicating that the data display device is in a predetermined state from the data display device, the request processing unit transmits the list to the data display device, and displays the data display When the transmission request including information indicating that the apparatus is in a state different from the predetermined state is received, the display data is read from the display data storage unit, and the read display data is The server apparatus according to claim 10, wherein the transmission request is transmitted to the data display apparatus that has transmitted the transmission request.   The server device according to claim 11, wherein the predetermined state is a state in which the power supply unit of the data display device is not supplying power to the image display unit.   The request processing unit generates a program that includes the list and acquires display data based on the list, and transmits the generated program. The server device according to the section. For each of the data display device or the other server device, further comprising a storage position information storage unit for storing the starting storage position information,
The said display data acquisition part acquires the said display data based on the said starting point storage position information which the said storage position information storage part memorize | stores. The Claim 13 characterized by the above-mentioned. Server device.   When the storage position information of the RSS file that is the file indicating the position information of the display data and the identification information of the data display device are input from the data display device, the request processing unit receives the storage position information of the RSS file and the information The server apparatus according to claim 14, wherein the server apparatus stores the identification information of the data display apparatus in association with the storage position information storage unit. The display data indicated by the storage location information includes storage location information of link destination display data,
The display data analysis unit reads storage location information of the link display data from the display data acquired by the display data acquisition unit,
16. The storage location information list generation unit generates a storage location information list including storage location information of the link destination display data read by the display data analysis unit. The server device according to any one of the items.

Images