JP2013097559A - Communication system, display device, electronic equipment and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a user to obtain his or her desired content file with a simple user operation.SOLUTION: In a communication system in which first and second portable terminals and a display device are connected via a network to each other, the first portable terminal transmits a content file owned by its own terminal to the display device, and the display device successively displays the content file received from the first portable terminal, and stores the information of the content file showing the file name of the content file being displayed at present and the content file being displayed at present, and the second portable terminal transmits an acquisition request message for acquiring the content file being displayed at present by the display device to the display device, and acquires the content file from the display device as a response to the acquisition request message.

Description

  The present invention relates to a communication system and a communication method for acquiring content files from an unspecified number of partner devices.

  A DLNA-compatible device refers to a device that conforms to the guidelines of DLNA (Digital Living Network Alliance). In the DLNA guidelines, existing standards are combined to unify the protocol and realize interoperability of various devices. For example, as a wired / wireless network system for connecting devices, standards such as Ethernet (registered trademark) for wired and Wi-Fi (registered trademark) for wireless can be used. Further, UPnP can be used for searching between devices, HTTP can be used for file transfer procedures, and XML can be used for exchanging metadata between devices. Therefore, in a home network to which a DLNA compatible device is connected, moving image data can be received from the server device, an image file can be uploaded to the server device, and content data can be shared by the DLNA compatible device.

  In Patent Literature 1, a mobile phone A that remotely controls a mobile phone B that images a subject transmits a shutter command to the mobile phone B at a timing desired by the user. Then, the cellular phone A receives and stores the data of the subject imaged by the cellular phone B. In this case, the mobile phone A needs to uniquely specify the mobile phone B as the counterpart device in order to perform remote operation.

JP 2009-267663 A

  When transmitting / receiving files between DLNA-compatible devices, the user selects a desired counterpart device from the DLNA-compatible device list and moves to a folder in which the desired file exists. When transmitting / receiving a plurality of files to / from a plurality of counterpart devices, it is necessary to reselect a desired counterpart device according to the file, and these operations are troublesome for the user. In addition, when a plurality of DLNA-compatible devices display content files owned by each device on a single display device and share them, which DLNA-compatible device owns the content file displayed on the display device There is no way to know what you are doing. With the technique disclosed in Patent Document 1, desired content can be acquired with a simple operation by uniquely specifying a desired counterpart device. However, when there are a plurality of counterpart devices, a desired content file cannot be acquired if the counterpart device cannot be identified.

  An object of the present invention is to provide a communication system, a display device, an electronic device, and a communication method capable of acquiring a desired content file from an unspecified number of partner devices with a simple operation.

  As one aspect of the present invention, in the communication system in which the first and second portable terminals and the display device are connected to each other via a network, the first portable terminal has a content file owned by the own terminal in the display device. The display device sequentially displays the content file received from the first portable terminal, and displays the content file information indicating the file name of the currently displayed content file and the currently displayed content file. And the second portable terminal transmits an acquisition request message for acquiring the content file currently displayed on the display device to the display device, and returns the corresponding content file as a response to the acquisition request message. Obtained from the display device.

  As one aspect of the present invention, in the communication system in which the first and second portable terminals and the display device are connected to each other via a network, the first portable terminal has a content file owned by the own terminal in the display device. The display device sequentially displays the content files received from the first portable terminal, and indicates the file name of the currently displayed content file and the content file displayed in the past, and the display order. Content file information and a currently displayed content file are held, and the second portable terminal acquires a content file displayed by a predetermined amount from the content file currently displayed on the display device. The acquisition request message is transmitted to the display device, and the response to the acquisition request message Acquiring a content file from the display device.

  As one aspect of the present invention, in the communication system in which the first and second portable terminals and the display device are connected to each other via a network, the first portable terminal has a content file owned by the own terminal in the display device. The display device sequentially displays the content file received from the first mobile terminal, and the display start time and the display end time of the content file currently displayed and the content file displayed in the past, Content file information indicating the file name and the currently displayed content file, and the second portable terminal displays the content file displayed on the display device at the time of generation of the content file acquisition request message. Is sent to the display device, and the acquisition request message is acquired. As a response message, acquires the corresponding content file from the display device.

  As one aspect of the present invention, in the communication system in which the first and second portable terminals and the display device are connected to each other via a network, the first portable terminal has a content file owned by the own terminal in the display device. The display device sequentially displays the content file received from the first portable terminal, and holds the content file information indicating the owner and file name of the currently displayed content file, The second portable terminal transmits an inquiry message for inquiring about the owner of the content file currently displayed on the display device to the display device, and returns the owner and file name of the corresponding content file as a response to the inquiry message. Information is obtained from the display device and based on a response to the inquiry message. , It transmits an acquisition request message for acquiring the corresponding content file to the first mobile terminal, as a response to the acquisition request message, and acquires the corresponding content file from the first mobile terminal.

  As one aspect of the present invention, in the communication system in which the first and second portable terminals and the display device are connected to each other via a network, the first portable terminal has a content file owned by the own terminal in the display device. The display device sequentially displays the content files received from the first portable terminal, and the currently displayed content file, the owner of the content file displayed in the past, the file name, and the display The content file information indicating the order is held, and the second portable terminal displays the inquiry message inquiring about the owner of the content file displayed by a predetermined amount from the content file currently displayed on the display device. To the device, and in response to the inquiry message, the corresponding content file The information indicating the owner and the file name is acquired from the display device, and based on the response to the inquiry message, an acquisition request message for acquiring the corresponding content file is transmitted to the first portable terminal, and the acquisition is performed. In response to the request message, the corresponding content file is acquired from the first portable terminal.

  As one aspect of the present invention, in the communication system in which the first and second portable terminals and the display device are connected to each other via a network, the first portable terminal has a content file owned by the own terminal in the display device. The display device sequentially displays the content file received from the first mobile terminal, and the display start time and the display end time of the content file currently displayed and the content file displayed in the past, The content file information indicating the owner and the file name is held, and the second portable terminal inquires about the owner of the content file displayed on the display device at the generation time of the content file owner inquiry message. Sending an inquiry message to the display device; As an answer, information indicating the owner and file name of the corresponding content file is acquired from the display device, and an acquisition request message for acquiring the corresponding content file is acquired based on a response to the inquiry message. The content file is transmitted to the terminal and the corresponding content file is acquired from the first portable terminal as a response to the acquisition request message.

  As one aspect of the present invention, in the communication system in which the first and second portable terminals and the display device are connected to each other via a network, the first portable terminal has a content file owned by the own terminal in the display device. And the content file information indicating the display start time on the display device and the file name of the displayed content file is stored, and the display device receives the content file received from the first portable terminal. The second mobile terminal sequentially displays an inquiry message inquiring about the owner of the content file currently displayed on the display device, and information indicating the generation time of the inquiry message. Holding the first portable terminal and the display device, the owner inquiry message In response, content file information indicating the display start time and file name of the content file held by the terminal is transmitted to the second portable terminal, and the second portable terminal transmits the first portable terminal Based on the content file information received from the terminal and the display device and the generation time of the inquiry message, the content file displayed on the display device immediately before the generation time of the inquiry message is specified, and the specified content file is An acquisition request message for acquisition is transmitted to the first portable terminal, and a corresponding content file is acquired from the first portable terminal as a response to the acquisition request message.

  As one aspect of the present invention, in the communication system in which the first and second portable terminals and the display device are connected to each other via a network, the first portable terminal has a content file owned by the own terminal in the display device. And the content file information indicating the display start time on the display device and the file name of the displayed content file is stored, and the display device receives the content file received from the first portable terminal. The second mobile terminal sequentially transmits an inquiry message inquiring about the owner of the content file displayed on the display device at the generation time of the content file owner inquiry message into the network, and , Holding information indicating the generation time of the inquiry message, The band terminal and the display device, as a response to the owner inquiry message, display the content file information indicating the display start time and file name of the content file held in the terminal immediately before the generation time of the inquiry message. The second portable terminal transmits the inquiry message based on the content file information received from the first portable terminal and the display device and the generation time of the inquiry message. The content file that was displayed on the display device immediately before the time is specified, an acquisition request message for acquiring the specified content file is transmitted to the first portable terminal, and as a response to the acquisition request message, Whether the content file to be processed is the first portable terminal To get.

  As one aspect of the present invention, there is provided a communication method in a communication system in which first and second portable terminals and a display device are connected to each other via a network, wherein the first portable terminal is connected to the display device by itself. Transmitting the content file owned by the display device, the display device sequentially displays the content file received from the first portable terminal, and the content file information indicating the file name of the currently displayed content file and Holding the content file currently being displayed, and the second portable terminal transmits an acquisition request message for acquiring the content file currently being displayed on the display device to the display device, and the acquisition request message A corresponding content file is acquired from the display device as a response to .

  As one aspect of the present invention, in the communication system in which the first and second portable terminals and the display device are connected to each other via a network, the first portable terminal has a content file owned by the own terminal in the display device. And the display device sequentially displays the content file received from the first portable terminal, and retains the content file information indicating the owner and file name of the currently displayed content file And the second portable terminal transmits an inquiry message inquiring about the owner of the content file currently displayed on the display device to the display device, and the owner of the corresponding content file is returned as a response to the inquiry message. And obtaining information indicating the file name from the display device; The second mobile terminal transmits an acquisition request message for acquiring the corresponding content file to the first mobile terminal based on the response of the inquiry message, and the corresponding content is returned as the response of the acquisition request message. Obtaining a file from the first portable terminal.

  As one aspect of the present invention, there is provided a communication method in a communication system in which first and second portable terminals and a display device are connected to each other via a network, wherein the first portable terminal is connected to the display device by itself. Transmitting the content file owned by the display device, and holding the content file information indicating the display start time on the display device and the file name of the displayed content file, and the display device includes the first mobile phone Sequentially displaying content files received from the terminal, and the second portable terminal transmits an inquiry message inquiring about the owner of the content file currently displayed on the display device into the network, and A step of holding information indicating a generation time of an inquiry message, and the first portable terminal And the display device transmits, as a response to the owner inquiry message, content file information indicating a display start time and a file name of the content file held in the terminal to the second portable terminal; The second portable terminal is displayed on the display device immediately before the generation time of the inquiry message based on the content file information received from the first portable terminal and the display device and the generation time of the inquiry message. The step of identifying the content file that has been stored, and the second mobile terminal transmits an acquisition request message for acquiring the specified content file to the first mobile terminal, and as a response to the acquisition request message, Retrieve the corresponding content file from the first mobile terminal. And a step of.

  As one aspect of the present invention, display means for displaying a content file transmitted from the first portable terminal, content file information storage means for holding information for specifying the content file, and transmission from the second portable terminal Communication means for transmitting information specifying the content file to the second portable terminal in response to the inquiry message.

  As one aspect of the present invention, when the communication unit receives the inquiry message from the second portable terminal, the communication unit stores information for identifying the content file corresponding to the content file displayed on the display unit. Transmit to the second portable terminal.

  As one aspect of the present invention, the information specifying the content file is information relating to an owner of the content file.

  As one aspect of the present invention, the information specifying the content file is information relating to a display time of the content file.

  One embodiment of the present invention includes any one of the display devices described above.

  According to the communication system, the display device, the electronic device, and the communication method according to the present invention, a desired content file can be acquired from an unspecified number of partner devices by a simple operation.

(A) An example of a communication system according to an embodiment of the present invention (1), (b) a block diagram showing a configuration of a mobile terminal according to an embodiment of the present invention Operation example 1 of content file acquisition in the communication system shown in FIG. Operation example 2 of content file acquisition in the communication system shown in FIG. Operation example 3 of content file acquisition in the communication system shown in FIG. An example of a communication system according to an embodiment of the present invention (2) Operation example 4 of content file acquisition in the communication system shown in FIG. Operation example 5 of content file acquisition in the communication system shown in FIG. Operation example 6 of content file acquisition in the communication system shown in FIG. Operation example 7 of content file acquisition in the communication system shown in FIG. Operation example 8 of content file acquisition in the communication system shown in FIG. Example 9 of content file acquisition in the communication system shown in FIG. Example of communication system according to the embodiment of the present invention (3) Operation example 10 of content file acquisition in the communication system shown in FIG. Operation example 11 of content file acquisition in the communication system shown in FIG. (A)-(c) is a figure which shows the example of a management table (A) Diagram showing user interface operation 1 (content file display), (b) Diagram showing user interface operation 2 (content file acquisition)

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In DLNA, in order to acquire a content file, it is necessary to specify the terminal that owns the content file and to specify this file from the folder of the terminal. However, if the number of terminals is large or the folders of the terminals are located deep in the hierarchy, the operation of specifying the terminal that owns the content file or searching for the folder becomes a very troublesome operation for the user. Therefore, the mobile terminal according to the present embodiment will be described with respect to a method for acquiring a content file from a mobile terminal that owns the content file without such a troublesome operation for the user. Here, in the present embodiment, the content file includes still image data, moving image data, music data, application data, and the like.

  FIG. 1A is an example of a communication system in the present embodiment. Here, the mobile terminal A, the mobile terminal B, the mobile terminal C, and the display device D are DLNA compatible devices. The mobile terminal A, the mobile terminal B, and the mobile terminal C can display a content file owned by each mobile terminal on the display device D within the local network. In addition, content files owned by each mobile terminal can be shared within a local network formed by the mobile terminal A, the mobile terminal B, the mobile terminal C, and the display device D.

  The outline of the operation of the communication system will be described with reference to FIG. In the communication system shown in FIG. 1A, the portable terminal B transmits the content file owned by the mobile terminal B to the display device D (step S101), and the display device D displays the content file (step S102). The portable terminal A transmits an acquisition request message for acquiring the content file being displayed (step S103). Then, based on the acquisition request message, the display device D transmits the content file being displayed to the mobile terminal A (step S105).

  With reference to FIG.1 (b), the structure of the portable terminal A is demonstrated. FIG.1 (b) is a block diagram which shows the structure of the portable terminal A and the display apparatus D which comprise the communication system shown to Fig.1 (a). The mobile terminals A, B, and C have the same configuration, and the configuration of the mobile terminals B and C is omitted in FIG.

<Configuration of mobile terminal>
The mobile terminal A shown in FIG. 1B includes an input processing unit 103, a DLNA processing unit 105, a communication control unit 107, an owner inquiry processing unit 109, and an operation start time storage unit 111.

  The input processing unit 103 receives a user input operation and outputs a processing operation signal corresponding to the user input operation to the DLNA processing unit 105 or the owner inquiry processing unit 109.

  For example, a signal corresponding to a user input operation for displaying a content file held by the terminal on the display device D is output to the DLNA processing unit 105, and other portable terminals B and C are currently being displayed on the display device D. A signal corresponding to the user input operation for acquiring the content file is output to the DLNA processing unit 105 or the owner inquiry processing unit 109.

  Further, when the user input operation is an input operation for acquiring a content file currently displayed on the display device D, the input processing unit 103 is information indicating an operation start time for acquiring the content file. Is output to the operation start time storage unit 111.

  The operation start time storage unit 111 stores information indicating the operation start time for acquiring the content file generated by the input processing unit 103. The information indicating the operation start time for acquiring the content file is information indicating the generation time of the “content file acquisition request message” or the information indicating the generation time of the “content file owner inquiry message”.

  The DLNA processing unit 105 generates various messages to be transmitted to the mobile terminals B and C or the display device D in the local network based on the signal from the input processing unit 103, and sends the generated messages to the communication control unit 107. Output.

(Content file display request message)
For example, when a signal corresponding to an input operation for displaying a content file held by the terminal is displayed on the display device D, the DLNA processing unit 105 generates a “content file display request message”. The content file is output to the communication control unit 107 together with the generated “content file display request message”.

(Content file acquisition request message)
When acquiring a content file from another mobile terminal or the display device D, the DLNA processing unit 105 generates a “content file acquisition request message” for acquiring the content file currently displayed on the display device D. And output to the communication control unit 107.

  The “content file acquisition request message” is not necessarily a message for acquiring a content file currently displayed on the display device D. For example, the “content file acquisition request message” may include information indicating how many times the latest content file is requested to be acquired on the display device D. Further, information indicating the generation time of the “content file acquisition request message” (that is, the operation start time for acquiring the content file) may be included in the “content file acquisition request message”. Thus, even if a content file transmitted from another mobile terminal is displayed on the display device D after the content file acquisition operation is started, the content file is actually displayed on the display device D at the operation start time for file acquisition. It is possible to acquire the content file that has been stored.

  The DLNA processing unit 105 executes processing corresponding to the message for the own terminal input from the communication control unit 107. For example, the DLNA processing unit 105 acquires a content file from another mobile terminal using a “content file acquisition request response message”.

(Content file owner inquiry message)
When acquiring the content file from the owner, the owner inquiry processing unit 109 generates a “content file owner inquiry message” for inquiring about the owner of the content file currently displayed on the display device D, The generated “content file owner inquiry message” is output to the communication control unit 107.

  The “content file owner inquiry message” is not necessarily a message for inquiring about the owner of the content file currently displayed on the display device D. For example, the “content file owner inquiry message” may include information indicating how many times the content file displayed on the display device D is inquired from the latest one. Furthermore, information indicating the generation time of the “content file owner inquiry message” (that is, the operation start time for acquiring the content file) may be included in the “content file owner inquiry message”. Thus, even when the content file transmitted from the other mobile terminals B and C is displayed on the display device D after the content file acquisition operation is started, the display device is actually displayed at the operation start time for file acquisition. The content file displayed in D can be acquired.

  When the “content file owner inquiry response message” is input from the communication control unit 107, the owner inquiry processing unit 109 sends the current content file owner indicated by the “content file owner inquiry response message” to the current owner. The DLNA processing unit 105 is requested to generate a “content acquisition request message” for acquiring the content file being displayed on the display device D.

  The communication control unit 107 includes a “content file display request message” and a content file owned, a “content file acquisition request message” that is a message generated by the DLNA processing unit 105, or a message generated by the owner inquiry processing unit 109. The “content file owner inquiry message” is transmitted to the display device D or the owner of the content file (mobile terminal B or C).

  Furthermore, the communication control unit 107 receives a message or content file transmitted from another portable terminal or display device D in the local network to the local terminal, and outputs it to the DLNA processing unit 105 or the owner inquiry processing unit.

  For example, upon receiving a “content file owner inquiry response message” from the display device D, the communication control unit 107 outputs this “content file owner inquiry response message” to the owner inquiry processing unit 109.

  In addition, when the communication control unit 107 receives a content file from another mobile terminal in the local network or the display device D by a “content file acquisition request response message”, the communication control unit 107 converts the received content file to “content file acquisition”. It is output to the DLNA processing unit 105 together with the “request response message”.

<Configuration of display device>
The configuration of the display device D will be described with reference to FIG. 1B includes a communication control unit 501, a DLNA processing unit 503, a display control unit 505, a content file information storage unit 507, an inquiry file determination unit 509, and a display unit 511. Prepare.

  The communication control unit 501 performs processing for receiving content files, various messages, and the like transmitted from each mobile terminal in the local network, and outputs them to the DLNA processing unit 503 or the inquiry file determination unit 509.

(Content file display request message)
Upon receiving the content file together with the “content file display request message” from each mobile terminal in the local network, the communication control unit 501 outputs the content file and the “content file display request message” to the DLNA processing unit 503.

(Content file acquisition request response message)
When receiving the “content file acquisition request message” from the mobile terminal in the local network, the communication control unit 501 outputs it to the DLNA processing unit 503. Thereafter, the communication control unit 501 transmits the content file input from the DLNA processing unit 503 to the portable terminal that is the transmission source of the “content file acquisition request message” together with the “content file acquisition request response message”.

(Content file owner inquiry response message)
When the communication control unit 501 receives the “content file owner inquiry message” from each portable terminal, the communication control unit 501 outputs it to the inquiry file determination unit 509. Thereafter, the communication control unit 501 transmits the “content file owner inquiry response message” input from the inquiry file determination unit 509 to the mobile terminal that is the transmission source of the “content file owner inquiry message”. For example, the “content file owner inquiry response message” includes information indicating the owner of the content file currently displayed on the display device D and the file name of the content file.

  The DLNA processing unit 503 outputs the content file transmitted from each portable terminal to the display control unit 505 based on the “content file display request message” input from the communication control unit 501. At this time, the DLNA processing unit 503 generates content file information based on the content file and information indicating the transmission source included in the “content file display request message”, and uses the content file information and the content file information as content file information. The data is output to the storage unit 507.

  Here, the content file information includes, for example, information indicating the owner of the content file, content file name, information indicating the display order of the content file, information indicating the display start time of the content file, and display end time of the content file. Is included.

<Management table>
The content file information storage unit 507 stores the content file information input from the DLNA processing unit 503 as a management table.

  An example of the management table will be described with reference to FIGS. The content file information includes, for example, information indicating the owner of the content file, content file name, information indicating the display order of the content file, information indicating the display start time of the content file, and information indicating the display end time of the content file Is included.

  As shown in FIG. 15A, the content file information stored in the content file information storage unit 507 may always hold the latest display content file name.

  As shown in FIG. 15B, the content file information stored in the content file information storage unit 507 may hold the display order thereof together with the content file name.

  As shown in FIG. 15C, the content file information stored in the content file information storage unit 507 may hold the display start time and the display end time together with the content file name.

(Content file acquisition request response message)
Also, the DLNA processing unit 503 stores the content file currently displayed on the display device D, that is, the latest content file based on the “content file acquisition request message” input from the communication control unit 501, as a content file information storage unit 507. (See FIG. 15A). Then, the DLNA processing unit 503 outputs the latest content file to the communication control unit 501 in order to transmit the latest content file together with the “content file acquisition request response message” to the transmission source of the “content file acquisition request message”.

  In addition, when the “content file acquisition request message” clearly indicates how many previous display content files should be acquired from the latest display content file, the DLNA processing unit 503 sets the corresponding content file as the content. Obtained from the file information storage unit 507 (see FIG. 15B). Then, the DLNA processing unit 503 outputs the corresponding content file to the communication control unit 501 in order to transmit the content file together with the “content file acquisition request response message” to the transmission source of the “content file acquisition request message”.

  In addition, the DLNA processing unit 503 indicates that information indicating the generation time of the “content file acquisition request message” (that is, the operation start time for acquiring the content file) is specified in the “content file acquisition request message”. Acquires the corresponding content file, that is, the content file displayed on the display device D at the start of the operation for acquiring the content file, from the content file information storage unit 507 (see FIG. 15C). Then, the DLNA processing unit 503 outputs the corresponding content file to the communication control unit 501 in order to transmit the content file together with the “content file acquisition request response message” to the transmission source of the “content file acquisition request message”.

  The display control unit 505 performs processing for sequentially displaying the content files input from the DLNA processing unit 503 on the display unit 511. Content files are overwritten and displayed on the display unit 511 in the order received. For example, when the display device D receives the content file b1 of the mobile terminal B after receiving the content file a1 of the mobile terminal A, the content file a1 is displayed on the display unit 511 and then the content file a1. Disappears and the content file b1 is displayed on the display unit 511. In addition to overwriting the content file, the display unit 511 may display, for example, the latest file on the screen and the previous file may be displayed at the bottom of the screen under the control of the display control unit 505. Alternatively, it may be displayed like a thumbnail list. In addition, the display method in these display parts 511 is an example, and is not limited to this.

(Content file owner inquiry response message)
Based on the “content file owner inquiry message” received from each mobile terminal, the inquiry file determination unit 509 displays the owner of the content file currently displayed on the display device D and the file name of the content file as content file information. The determination is made based on the content file information stored in the storage unit 507. Then, based on the determination result, the inquiry file determination unit 509 generates a “content file owner inquiry response message” including the owner of the content file currently displayed on the display device D and the file name of the content file. Then, the inquiry file determination unit 509 outputs the generated “content file owner inquiry response message” to the communication control unit 501.

  Here, if the “content file owner inquiry message” contains information indicating how many times the owner of the content file displayed before the latest one is inquired, the content file of the corresponding content file The inquiry file determination unit 509 generates a “content file owner inquiry response message” indicating the owner and the file name of the content file.

  Further, when the “content file owner inquiry message” includes the generation time of the “content file owner inquiry message” (that is, the operation start time for acquiring the content file), the corresponding content file The inquiry file determination unit 509 generates a “content file owner inquiry response message” indicating the owner of the file and the file name of the content file.

  Next, operation examples 1 to 3 of the communication system illustrated in FIG. 1A will be described with reference to FIGS.

<Operation example 1>
With reference to FIG. 2, an example of the content file acquisition operation in the present embodiment will be described.

  In FIG. 2, the content file is simply expressed as a file. The portable terminal A holds the content file a1 (denoted as file a1 in the figure), and the portable terminal B represents the content file b1 (denoted as file b1 in the figure) and the content file bn (denoted as file bn in the figure). ) And the portable terminal C is assumed to hold the content file c1 (file c1 in the figure).

  In addition, the arrow surrounding the oblique line shown in FIG. 2 shows user operation. For example, an operation for transmitting a content file to the display device D and an operation for acquiring a content file being displayed on the display device D (or displayed in the past).

  In FIG. 2, the operation in which the mobile terminal A acquires the content file being displayed on the display device D will be described as an example, but the same operation can be performed in either of the mobile terminals B and C.

  FIG. 2 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S201, the portable terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D.

  In step S <b> 203, the display device D displays the content file a <b> 1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A. At this time, the display device D stores the information (content file name) of the content file a1 and the content file a1 (see FIG. 15A).

  In step S205, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D.

  In step S207, the display device D displays the content file c1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C. At this time, the display device D overwrites the information (content file name) and content file c1 of the content file c1 over the stored information and content file a1 of the content file a1 (see FIG. 15A).

  In step S209, the portable terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D.

  In step S211, the display device D displays the content file b1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, the display device D overwrites the information (content file name) and content file b1 of the content file b1 over the stored information and content file c1 of the content file c1 (see FIG. 15A).

  In step S213, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D.

  In step S215, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, the display device D overwrites the information (content file name) and content file bn of the content file bn over the stored information and content file b1 of the content file b1 (see FIG. 15A).

  In step S217, the portable terminal A transmits a “content file acquisition request message” to the display device D in order to acquire the content currently being displayed on the display device D. At the time of this transmission, as indicated by an arrow in the figure, a user operation for acquiring a content file currently being displayed on the display device D is input to the portable terminal A. In step S217, the mobile terminal A cannot identify the content file displayed on the display device D.

  In step S219, the display device D specifies the content file bn currently displayed on the display device D based on the “content file acquisition request message”. In step S221, the display device D transmits the identified content file bn to the mobile terminal A that is the transmission source of the “content file acquisition request message”.

  As described above, in the present embodiment, in order to obtain a desired content file, a user who specifies the terminal that owns the desired content file or searches for a folder hierarchical structure does not need to go through troublesome operations for the user. With a simple user operation, the portable terminal A can acquire the content file currently being displayed from the display device D.

<Operation example 2>
With reference to FIG. 3, an example of a content file acquisition operation in the present embodiment will be described.

  In FIG. 3, the content file is simply expressed as a file. The portable terminal A holds the content file a1 (denoted as file a1 in the figure), and the portable terminal B has the content file b1 (denoted as file b1 in the figure) and the content file bn-1 (denoted as file bn in the figure). -1) and content file bn (denoted as file bn in the figure), and portable terminal C is assumed to retain content file c1 (file c1 in the figure).

  In addition, the arrow surrounding the oblique line shown in FIG. 3 shows user operation. For example, an operation for transmitting a content file to the display device D and an operation for acquiring a content file being displayed on the display device D (or displayed in the past).

  In FIG. 3, the operation in which the mobile terminal A acquires the content file being displayed on the display device D will be described as an example. However, the same operation can be performed in both the mobile terminals B and C.

  FIG. 3 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S301, the portable terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D.

  In step S303, the display device D displays the content file a1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A. At this time, the display device D stores the information of the content file a1 (content file name and content file display order (first)) and the content file a1 (see FIG. 15B).

  In step S305, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D.

  In step S307, the display device D displays the content file c1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C. At this time, in addition to the information of the content file a1, the display device D stores the information of the content file c1 (content file name and content file display order (second)) and the content file c1 (FIG. 15B). )reference).

  In step S309, the portable terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D.

  In step S311, the display device D displays the content file b1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1 and c1, the display device D stores the information on the content file b1 (content file name and content file display order (third)) and the content file b1 (FIG. 15). (See (b)).

  In step S313, the portable terminal B transmits the content file bn-1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn-1 on the display device D.

  In step S315, the display device D displays the content file bn-1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1, c1, and b1, the display device D includes information on the content file bn-1 (content file name and content file display order ((n-1)) th) and content. The file bn-1 is stored (see FIG. 15B).

  In step S317, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D.

  In step S319, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1, c1, b1, and bn−1, the display device D includes information on the content file bn (content file name and content file display order ((nth)) and content file. bn is stored (see FIG. 15B).

  In step S321, the portable terminal A transmits a “content file acquisition request message” to the display device D in order to acquire the content file displayed immediately before the content file currently displayed on the display device D. To do. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for acquiring a content file displayed immediately before the content file currently displayed on the display device D. It has been broken. The “content file acquisition request message” includes a message requesting acquisition of a content file displayed immediately before the content file currently displayed on the display device D. In step S321, the portable terminal A cannot identify the content file displayed on the display device D.

  In step S323, the display device D specifies the content file bn-1 displayed immediately before the content file bn currently displayed on the display device D based on the “content file acquisition request message”. In step S325, the display device D transmits the content file bn-1 to the mobile terminal A that is the transmission source of the “content file acquisition request message”.

  As described above, in the present embodiment, in order to obtain a desired content file, a user who specifies the terminal that owns the desired content file or searches for a folder hierarchical structure does not need to go through troublesome operations for the user. By a simple user operation, the mobile terminal A can acquire the content file displayed on the display device D in a predetermined order from the display device D.

<Operation example 3>
With reference to FIG. 4, an example of the content file acquisition operation in the present embodiment will be described.

  In FIG. 4, the content file is simply expressed as a file. The portable terminal A holds the content file a1 (denoted as file a1 in the figure), and the portable terminal B represents the content file b1 (denoted as file b1 in the figure) and the content file bn (denoted as file bn in the figure). ), Content file bn + 1 (denoted as file bn + 1 in the figure) is held, and portable terminal C is assumed to hold content file c1 (file c1 in the figure).

  In addition, the arrow surrounding the oblique line shown in FIG. 4 shows user operation. For example, an operation for transmitting a content file to the display device D and an operation for acquiring a content file being displayed on the display device D (or displayed in the past).

  In FIG. 4, the operation in which the mobile terminal A acquires the content file being displayed on the display device D will be described as an example, but the same operation can be performed in both the mobile terminals B and C.

  FIG. 4 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S401, the portable terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D.

  In step S403, the display device D displays the content file a1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A. At this time, the display device D stores the information (content file name, display start time 12:00:00) and the content file a1 of the content file a1 (see FIG. 15C).

  In step S405, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D.

  In step S407, the display device D displays the content file c1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C. At this time, in addition to the information on the content file a1, the display device D adds information on the content file c1 (content file name, display start time 12:00:05, and display end time 12:00 on the previous content file a1). 05) and the content file c1 are stored (see FIG. 15C).

  In step S409, the portable terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D.

  In step S411, the display device D displays the content file b1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1 and c1, the display device D includes information on the content file b1 (content file name, display start time 12:00:08, and display end time 12: of the previous content file c1: 00:08) and the content file b1 are stored (see FIG. 15C).

  In step S413, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D.

  In step S415, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1, c1, and b1, the display device D includes information on the content file bn (content file name, display start time 12:05:20, and display end time of the previous content file b1). 12:05:20) and the content file bn are stored (see FIG. 15C).

(Start of content file acquisition operation)
In step S416, the mobile terminal A provides the display device D with information indicating the generation time of the “content file acquisition request message” (that is, the operation start time 12:05:23 for acquiring the content file). File acquisition request message ”is generated. At this time, as indicated by an arrow in the figure, in the mobile terminal A, a user operation for acquiring a content file has started, but has not yet been confirmed. That is, in step S416, the content file acquisition process is started, but this “content file acquisition request message” has not yet been transmitted from the portable terminal A to the display device D.

(Interrupt (user operation))
In step S417, the portable terminal B transmits the content file bn + 1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn + 1 on the display device D.

  In step S419, the display device D displays the content file bn + 1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, the display device D adds information on the content file bn + 1 (content file name, display start time 12:05:25, and display end of the previous content file bn in addition to the information on the content files a1, c1, b1, and bn). Time 12:05:25) and the content file bn + 1 are stored (see FIG. 15C).

(Confirm content file acquisition operation)
In step S <b> 421, the mobile terminal A includes, for the display device D, “information content including information indicating the generation time of the“ content file acquisition request message ”(that is, operation start time 12:05:23 for content file acquisition). Send file acquisition request message. At this time, as indicated by an arrow in the figure, in the mobile terminal A, the user operation for acquiring the content file is confirmed. That is, in step S421, this “content file acquisition request message” is transmitted from the portable terminal A to the display device D.

(Identification of transmission content file)
In step S423, the display device D uses the generation time of the “content file acquisition request message” specified in the “content file acquisition request message” at the time when the operation for acquiring the content file is started in step S416. The content file bn that has been displayed is specified.

  In step S425, the display device D transmits the content file bn specified in step S423 to the mobile terminal A.

  As described above, in the present embodiment, in order to acquire a desired content file, a user holding the desired content file is specified, or a folder hierarchical structure is searched without performing a cumbersome operation for the user. The mobile terminal A can acquire the content file displayed on the display device D from the display device D when the content file acquisition operation is actually started by a simple user operation.

  FIG. 5 is an example of a communication system in the present embodiment. Here, the mobile terminal A, the mobile terminal B, the mobile terminal C, and the display device D are DLNA compatible devices. The mobile terminal A, the mobile terminal B, and the mobile terminal C can display the content file owned by each mobile terminal on the display device D within the local network. In addition, content files owned by each mobile terminal can be shared within a local network formed by the mobile terminal A, the mobile terminal B, the mobile terminal C, and the display device D.

  The outline of the operation of the communication system will be described with reference to FIG. In the communication system shown in FIG. 5, the mobile terminal B transmits the content file owned by the mobile terminal B to the display device D (step S501), and the display device D displays the content file (step S502). The portable terminal A inquires of the display device D about the owner of the content file being displayed (step S503). Then, as a result of the inquiry, the display device D notifies the owner of the content file to the mobile terminal A (step S505). Based on the inquiry result, the mobile terminal A transmits an acquisition request message for acquiring the content file being displayed on the display device D to the mobile terminal B that is the owner of the content file (step S507). Then, based on the acquisition request message, the mobile terminal B transmits the content file being displayed on the display device D to the mobile terminal A (step S509). Hereinafter, operation examples 4 to 9 of the communication system illustrated in FIG. 5 will be described with reference to FIGS.

<Operation example 4>
With reference to FIG. 6, an example of the content file acquisition operation in the present embodiment will be described.

  In FIG. 6, the content file is simply expressed as a file. The portable terminal A holds the content file a1 (denoted as file a1 in the figure), and the portable terminal B represents the content file b1 (denoted as file b1 in the figure) and the content file bn (denoted as file bn in the figure). ) And the portable terminal C is assumed to hold the content file c1 (file c1 in the figure).

  In addition, the arrow surrounding the oblique line shown in FIG. 6 shows user operation. For example, an operation for transmitting a content file to the display device D and an operation for acquiring a content file being displayed on the display device D (or displayed in the past).

  Although FIG. 6 illustrates an example of an operation in which the mobile terminal A acquires a content file being displayed on the display device D, the same operation can be performed in either of the mobile terminals B and C.

  FIG. 6 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S601, the mobile terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D.

  In step S <b> 603, the display device D displays the content file a <b> 1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A. At this time, the display device D stores information on the content file a1 (content file name, content file owner (mobile terminal A)) (see FIG. 15A).

  In step S605, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D.

  In step S <b> 607, the display device D displays the content file c <b> 1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C. At this time, the display device D overwrites the information of the content file c1 (content file name, content file owner (mobile terminal C)) with the stored information of the content file a1 (FIG. 15A). reference).

  In step S609, the mobile terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D.

  In step S611, the display device D displays the content file b1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, the display device D overwrites the information of the content file c1 (content file name, content file owner (mobile terminal B)) with the stored information of the content file c1 (FIG. 15A). reference).

  In step S613, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D.

  In step S615, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, the display device D overwrites the stored information on the content file b1 with the information on the content file bn (content file name, content file owner (mobile terminal B)) (FIG. 15A). reference).

  In step S617, the portable terminal A transmits a “content file owner inquiry message” for inquiring about the owner of the content file currently displayed on the display device D to the display device D. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A is currently performing a user operation for acquiring a content file being displayed on the display device D. In step S617, the portable terminal A cannot identify the content file displayed on the display device D and the owner.

  In step S619, the display device D specifies the owner of the content file bn currently displayed on the display device D based on the “owner inquiry message” received from the mobile terminal A. In step S621, in response to the “owner inquiry message”, the display device D displays the “content file” indicating the owner (mobile terminal B) of the content file bn currently displayed on the display device D and its content file name. An “owner inquiry response message” is transmitted to the portable terminal A.

  In step S623, the mobile terminal A includes the owner (mobile terminal B) of the content file bn currently displayed on the display device D and the content file bn included in the “content file owner inquiry response message” received from the display device D. The “content file acquisition request message” is transmitted to the portable terminal B based on the information indicating the file name.

  In step S625, the mobile terminal B transmits the corresponding content file bn to the mobile terminal A based on the “content file acquisition request message” received from the mobile terminal A.

  As described above, in the present embodiment, in order to acquire a desired content file, a user holding the desired content file is specified, or a folder hierarchical structure is searched without performing a cumbersome operation for the user. With a simple user operation, the mobile terminal A can acquire the content file being displayed on the display device D from the mobile terminal B.

<Operation example 5>
With reference to FIG. 7, an example of the content file acquisition operation in the present embodiment will be described.

  In FIG. 7, the content file is simply expressed as a file. The portable terminal A holds the content file a1 (denoted as file a1 in the figure), and the portable terminal B has the content file b1 (denoted as file b1 in the figure) and the content file bn-1 (denoted as file bn in the figure). -1) and content file bn (denoted as file bn in the figure), and portable terminal C is assumed to retain content file c1 (file c1 in the figure).

  In addition, the arrow surrounding the oblique line shown in FIG. 7 shows user operation. For example, an operation for transmitting a content file to the display device D and an operation for acquiring a content file being displayed on the display device D (or displayed in the past).

  Note that FIG. 7 illustrates an example of an operation in which the mobile terminal A acquires a content file being displayed on the display device D, but the same operation can be performed in either of the mobile terminals B and C.

  FIG. 7 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S701, the portable terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D.

  In step S <b> 703, the display device D displays the content file a <b> 1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A. At this time, the display device D stores information on the content file a1 (content file name, display order (first), and owner of the content file (mobile terminal A)) (see FIG. 15B).

  In step S705, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D.

  In step S707, the display device D displays the content file c1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C. At this time, in addition to the information on the content file a1, the display device D stores information on the content file c1 (content file name, display order (second), and owner of the content file (mobile terminal C)). (See FIG. 15 (b)).

  In step S709, the portable terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D.

  In step S711, the display device D displays the content file b1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1 and c1, the display device D displays the information on the content file b1 (content file name, display order (third), and owner of the content file (mobile terminal B)). Store (see FIG. 15B).

  In step S713, the portable terminal B transmits the content file bn-1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn-1 on the display device D.

  In step S715, the display device D displays the content file bn-1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1, c1, and b1, the display device D includes information on the content file bn-1 (content file name, display order (n−1)), and the owner of the content file ( Mobile terminal B)) is stored (see FIG. 15B).

  In step S717, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D.

  In step S719, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, the display device D adds information on the content file bn (content file name, display order (nth), and owner of the content file (nth) in addition to the information on the content files a1, c1, b1, bn-1). Mobile terminal B)) is stored (see FIG. 15B).

  In step S721, the mobile terminal A displays a “content file owner inquiry message” in order to inquire about the owner of the content file displayed immediately before the content file currently displayed on the display device D. Send to D. This “content file owner inquiry message” includes information for inquiring about the owner of the content file displayed immediately before the latest one. Further, at the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A makes an inquiry about the owner of the content file displayed immediately before the content file currently displayed on the display device D. User operation is being performed. In step S721, the mobile terminal A cannot identify the content file displayed on the display device D and the owner.

  In step S722, the display device D, based on the “owner inquiry message” received from the mobile terminal A, displays the content file bn−1 that was displayed immediately before the content file bn currently displayed on the display device D. Identify the owner. Then, in step S723, the display device D responds to the “content file owner inquiry message” with the owner of the content file bn−1 displayed immediately before the content file bn currently displayed on the display device D. (Portable terminal B) transmits a “content file owner inquiry response message” indicating the file name of the content file bn−1 to the portable terminal A.

  In step S725, the portable terminal A transmits a “content file acquisition request message” to the portable terminal B based on the “content file owner inquiry response message” received from the display device D.

  In step S727, the mobile terminal B transmits the corresponding content file bn-1 to the mobile terminal A based on the “content file acquisition request message” received from the mobile terminal A. The content file bn-1 is a content file displayed immediately before the content file bn currently displayed on the display device D.

  As described above, in the present embodiment, in order to acquire a desired content file, a user holding the desired content file is specified, or a folder hierarchical structure is searched without performing a cumbersome operation for the user. By a simple user operation, the portable terminal A can acquire the content file displayed before the content file bn currently displayed on the display device D from the portable terminal B.

<Operation example 6>
With reference to FIG. 8, an example of the content file acquisition operation in the present embodiment will be described.

  In FIG. 8, the content file is simply expressed as a file. The portable terminal A holds the content file a1 (denoted as file a1 in the figure), and the portable terminal B represents the content file b1 (denoted as file b1 in the figure) and the content file bn (denoted as file bn in the figure). ) And content file bn + 1 (denoted as file bn + 1 in the figure), and portable terminal C is assumed to hold content file c1 (file c1 in the figure).

  In addition, the arrow surrounding the oblique line shown in FIG. 8 shows user operation. For example, an operation for transmitting a content file to the display device D and an operation for acquiring a content file being displayed on the display device D (or displayed in the past).

  In FIG. 8, the operation in which the mobile terminal A acquires the content file being displayed on the display device D will be described as an example, but the same operation can be performed in both the mobile terminals B and C.

  FIG. 8 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S801, the portable terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D.

  In step S <b> 803, the display device D displays the content file a <b> 1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A. At this time, the display device D stores the information of the content file a1 (content file owner (mobile terminal A), content file name, display start time 12:00: 00) (see FIG. 15C). .

  In step S805, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D.

  In step S807, the display device D displays the content file c1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C. At this time, in addition to the information on the content file a1, the display device D includes information on the content file c1 (content file owner (mobile terminal C), content file name, display start time 12:00:05, and previous The display end time 12:00:05) of the content file a1 is stored (see FIG. 15C).

  In step S809, the portable terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D.

  In step S811, the display device D displays the content file b1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1 and c1, the display device D includes information on the content file b1 (content file owner (mobile terminal B), content file name, display start time 12:00:08, And the display end time 12:00:08) of the previous content file c1 is stored (see FIG. 15C).

  In step S813, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D.

  In step S815, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1, c1, and b1, the display device D includes information on the content file bn (content file owner (mobile terminal B), content file name, display start time 12:05: 20 and the display end time 12:05:20) of the previous content file b1 are stored (see FIG. 15C).

(Start of content file acquisition operation)
In step S816, the mobile terminal A includes information indicating the generation time of the “content file owner inquiry message” for the display device D (that is, the operation start time 12:05:23 for acquiring the content file). A content file owner inquiry message ”is generated. At this time, as indicated by an arrow in the figure, in the mobile terminal A, a user operation for acquiring a content file has started, but has not yet been confirmed. That is, in step S816, the content file acquisition process is started, but this “content file owner inquiry message” has not yet been transmitted from the portable terminal A to the display device D.

(Interrupt (user operation))
In step S817, the portable terminal B transmits the content file bn + 1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn + 1 on the display device D.

  In step S819, the display device D displays the content file bn + 1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1, c1, b1, and bn, the display device D includes information on the content file bn + 1 (content file owner (mobile terminal B), content file name, display start time 12: 05:25 and the display end time 12:05:25 of the previous content file bn) are stored (see FIG. 15C).

(Confirm content file acquisition operation)
In step S821, the mobile terminal A includes information indicating the generation time of the “content file owner inquiry message” for the display device D (that is, the operation start time 12:05:23 for acquiring the content file). Send “content file owner inquiry message”. At this time, as indicated by an arrow in the figure, in the mobile terminal A, the user operation for acquiring the content file is confirmed. That is, in step S821, the “content file owner inquiry message” is transmitted from the portable terminal A to the display device D. In step S821, the mobile terminal A cannot identify the content file displayed on the display device D and the owner.

(Identification of content file)
In step S823, the display device D starts an operation for acquiring a content file in step S816 based on the generation time of the “content file owner inquiry message” specified in the “content file owner inquiry message”. The content file bn displayed at the time is specified.

  In step S825, the display device D displays the file name of the content file bn displayed at the generation time of the “content file owner inquiry message” (that is, the operation start time 12:05:23 for acquiring the content file) and A “content file owner inquiry response message” indicating the owner (mobile terminal B) is transmitted to the mobile terminal A.

  In step S827, based on the “content file owner inquiry response message” received from the display device D, the mobile terminal A sends a “content file acquisition request message” to the mobile terminal B that is the owner of the corresponding content file bn. Send.

  In step S <b> 829, the mobile terminal B transmits the corresponding content file bn to the mobile terminal A based on the “content file acquisition request message” received from the mobile terminal A.

  As described above, in the present embodiment, in order to acquire a desired content file, a user holding the desired content file is specified, or a folder hierarchical structure is searched without performing a cumbersome operation for the user. By a simple user operation, the mobile terminal A acquires the content file displayed on the display device D when the content file acquisition operation is actually started from the owner (mobile terminal B) of the content file. Can do.

<Operation example 7>
With reference to FIG. 9, an example of the content file acquisition operation in the present embodiment will be described.

  In FIG. 9, the content file is simply expressed as a file. The portable terminal A holds the content file a1 (denoted as file a1 in the figure), and the portable terminal B represents the content file b1 (denoted as file b1 in the figure) and the content file bn (denoted as file bn in the figure). ) And the portable terminal C is assumed to hold the content file c1 (file c1 in the figure).

  In addition, the arrow surrounding the oblique line shown in FIG. 9 shows user operation. For example, an operation for transmitting a content file to the display device D and an operation for acquiring a content file being displayed on the display device D (or displayed in the past).

  Although FIG. 9 illustrates an example of an operation in which the mobile terminal A acquires a content file being displayed on the display device D, the same operation can be performed in either of the mobile terminals B and C.

  FIG. 9 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S901, the portable terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D. At the time of this transmission, the portable terminal A stores information (content file name) of the content file a1.

  In step S903, the display device D displays the content file a1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A. At this time, the display device D stores the information of the content file a1 (content file owner (mobile terminal A)).

  In step S905, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D. At the time of this transmission, the portable terminal C stores information (content file name) of the content file c1.

  In step S907, the display device D displays the content file c1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C. At this time, the display device D stores the information of the content file c1 (content file owner (mobile terminal C)) overwriting the stored information of the content file a1.

  In step S909, the portable terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D. At the time of this transmission, the portable terminal B stores the information (content file name) of the content file b1.

  In step S911, the display device D displays the content file b1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, the display device D stores the information on the content file b1 (the owner of the content file (mobile terminal B)) overwriting the stored information on the content file c1.

  In step S913, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D. At the time of this transmission, the portable terminal B stores the information (content file name) of the content file bn overwriting the information of the content file b1.

  In step S <b> 915, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, the display device D stores the information on the content file bn (content file owner (mobile terminal B)) overwriting the stored information on the content file b1.

  In step S <b> 917, the mobile terminal A transmits a “content file owner inquiry message” to the display device D in order to acquire the content currently displayed on the display device D. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A is currently performing a user operation for acquiring a content file being displayed on the display device D. In step S917, the portable terminal A cannot identify the content file displayed on the display device D and the owner.

  In step S919, the display device D specifies the owner of the content file currently displayed on the display device D based on the “content file owner inquiry message”. In step S921, the display device D responds with a “content file owner inquiry response” indicating the owner (mobile terminal B) of the content file currently displayed on the display device D as a response to the “content file owner inquiry message”. Message "is transmitted to the mobile terminal A.

  In step S923, the mobile terminal A acquires the content file currently displayed on the display device D from the content file owner (mobile terminal B) indicated by the “content file owner inquiry response message”. “Content file acquisition request message” is sent.

  In step S925, the mobile terminal B specifies the content file bn currently displayed on the display device D based on the “content file acquisition request message” received from the mobile terminal.

  In step S927, the portable terminal B transmits the identified content file bn to the portable terminal A.

  As described above, in the present embodiment, in order to acquire a desired content file, a user holding the desired content file is specified, or a folder hierarchical structure is searched without performing a cumbersome operation for the user. With a simple user operation, the mobile terminal A can acquire the content file currently being displayed on the display device D from the mobile terminal B that is the owner.

<Operation example 8>
With reference to FIG. 10, an example of the content file acquisition operation in the present embodiment will be described.

  In FIG. 10, the content file is simply expressed as a file. The mobile terminal A holds the content file a1 (denoted as file a1 in the figure), and the portable terminal B has the content file b1 (denoted as file b1 in the figure) and the content file bn-1 (denoted as file in the figure). bn-1) and content file bn (denoted as file bn in the figure), and mobile terminal C is assumed to retain content file c1 (file c1 in the figure).

  In addition, the arrow surrounding the oblique line shown in FIG. 10 shows user operation. For example, an operation for transmitting a content file to a mobile terminal functioning as a content file playback device, or an operation for acquiring a content file being displayed (or displayed in the past) on a mobile terminal functioning as a content file playback device It is.

  In FIG. 10, the operation in which the mobile terminal A acquires the content file being displayed on the display device D will be described as an example. However, the same operation can be performed in either of the mobile terminals B and C.

  FIG. 10 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S1001, the portable terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D. At the time of this transmission, the portable terminal A stores information (content file name, display order (first)) of the content file a1.

  In step S <b> 1003, the display device D displays the content file a <b> 1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A. At this time, the display device D stores information of the content file a1 (content file owner (mobile terminal A), display order (first)).

  In step S1005, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D. At the time of this transmission, the portable terminal C stores information (content file name, display order (first)) of the content file c1.

  In step S <b> 1007, the display device D displays the content file c <b> 1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C. At this time, in addition to the information on the content file a1, the display device D stores the information on the content file c1 (content file owner (mobile terminal C), display order (second)).

  In step S1009, the portable terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D. Further, at the time of this transmission, the portable terminal B stores information (content file name, display order (first)) of the content file b1.

  In step S <b> 1011, the display device D displays the content file b <b> 1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, the display device D stores the information of the content file b1 (the owner of the content file (mobile terminal B), the display order (third)) in addition to the information of the content files a1 and c1.

  In step S1013, the mobile terminal B transmits the content file bn-1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn-1 on the display device D. At the time of this transmission, the portable terminal B stores the information of the content file bn-1 (content file name, display order ((n-1) th)) in addition to the information of the content file b1. .

  In step S1015, the display device D displays the content file bn-1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1, c1, and b1, the display device D includes information on the content file bn-1 (content file owner (mobile terminal B), display order ((n-1)) th) )) Is stored (see FIG. 15B).

  In step S1017, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D. At the time of this transmission, the portable terminal B stores the information of the content file bn (content file name, display order (nth)) in addition to the information of the content files b1 and bn-1.

  In step S1019, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1, c1, b1, and bn−1, the display device D includes information on the content file bn (content file owner (mobile terminal B), display order (nth)). Is stored (see FIG. 15B).

  In step S1021, the mobile terminal A displays a “content file owner inquiry message” in order to inquire about the owner of the content file displayed immediately before the content file currently displayed on the display device D. Send to D. This “content file owner inquiry message” includes information for inquiring about the owner of the content file displayed immediately before the latest one. Further, at the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A makes an inquiry about the owner of the content file displayed immediately before the content file currently displayed on the display device D. User operation is being performed. In step S1021, the mobile terminal A cannot identify the content file displayed on the display device D and the owner.

  In step S1023, the display device D, based on the “content file owner inquiry message” received from the portable terminal A, owns the content file displayed immediately before the content file currently displayed on the display device D ( Identify mobile terminal B).

  In step S1025, the display device D has the content file owner (portable terminal B) displayed immediately before the content file currently displayed on the display device D and the owner (portable terminal B) of the content file. A “content file owner inquiry response message” including information indicating how many times it was displayed is transmitted to the mobile terminal A.

  In step S <b> 1027, the mobile terminal A transmits a “content file acquisition request message” to the mobile terminal B based on the “content file owner inquiry response message” received from the display device D.

  In step S1029, the mobile terminal B identifies the corresponding content file bn-1 based on the “content file acquisition request message” received from the mobile terminal A. The content file bn-1 is a content file displayed immediately before the content file bn currently displayed on the display device D.

  In step S1031, the mobile terminal B transmits the identified content file bn-1 to the mobile terminal A.

  As described above, in the present embodiment, in order to acquire a desired content file, a user holding the desired content file is specified, or a folder hierarchical structure is searched without performing a cumbersome operation for the user. By a simple user operation, the mobile terminal A can acquire the content file displayed before the content file bn currently displayed on the display device D from the mobile terminal B that is the owner.

<Operation example 9>
With reference to FIG. 11, an example of a content file acquisition operation in the present embodiment will be described.

  In FIG. 11, the content file is simply expressed as a file. The mobile terminal A holds the content file a1 (indicated as file a1 in the figure), and the mobile terminal B stores the content file b1 (indicated in the figure as file b1) and the content file bn (in the figure as file bn). 2) (notation) and content file bn + 1 (denoted as file bn + 1 in the figure), and portable terminal C is assumed to retain content file c1 (denoted as file c1 in the figure).

  In addition, the arrow surrounding the oblique line shown in FIG. 11 shows user operation. For example, an operation for transmitting a content file to a mobile terminal functioning as a content file playback device, or an operation for acquiring a content file being displayed (or displayed in the past) on a mobile terminal functioning as a content file playback device It is.

  In FIG. 11, the operation in which the mobile terminal A acquires the content file being displayed on the display device D will be described as an example. However, the same operation is possible in both the mobile terminals B and C.

  FIG. 11 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S1101, the portable terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D. At the time of this transmission, the portable terminal A stores the information of the content file a1 (content file name, display start time 12:00:00).

  In step S <b> 1103, the display device D displays the content file a <b> 1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A. At this time, the display device D stores the information of the content file a1 (owner (mobile terminal A), display start time 12:00:00).

  In step S1105, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D. At the time of this transmission, the portable terminal C stores information (content file name, display start time 12:00:05) of the content file c1.

  In step S1107, the display device D displays the content file c1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C. At this time, in addition to the information on the content file a1, the display device D includes information on the content file c1 (owner (mobile terminal C), display start time 12:00:05, and display end time 12 of the previous content file a1. : 00:05).

  In step S1109, the portable terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D. At the time of this transmission, the portable terminal B stores the information of the content file b1 (content file name, display start time 12:00:08).

  In step S <b> 1111, the display device D displays the content file b <b> 1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1 and c1, the display device D includes information on the content file b1 (owner (mobile terminal B), display start time 12:00:08, and display end of the previous content file c1. Time 12:00:08) is stored.

  In step S1113, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D. At the time of this transmission, the mobile terminal B stores the information (content file name, display start time 12:05:20) of the content file bn in addition to the information of the content file b1.

  In step S 1115, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1, c1, and b1, the display device D includes information on the content file bn (owner (mobile terminal B), display start time 12:05:20, and the previous content file b1. Display end time 12:05:20) is stored.

(Start of content file acquisition operation)
In step S1116, the mobile terminal A includes information indicating the generation time of the “content file owner inquiry message” for the display device D (that is, the operation start time 12:05:23 for acquiring the content file). A content file owner inquiry message ”is generated. At this time, as indicated by an arrow in the figure, in the mobile terminal A, a user operation for acquiring a content file has started, but has not yet been confirmed. That is, in step S1116, the content file acquisition process is started, but this “content file owner inquiry message” has not yet been transmitted from the portable terminal A to the display device D.

(Interrupt (user operation))
In step S1117, the mobile terminal B transmits the content file bn + 1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn + 1 on the display device D. At this time, the display device D stores information on the content file bn + 1 (content file name, display start time 12:05:25) in addition to the information on the content files b1 and bn.

  In step S 1119, the display device D displays the content file bn + 1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B. At this time, in addition to the information on the content files a1, c1, b1, and bn, the display device D includes information on the content file bn + 1 (owner (mobile terminal B), display start time 12:05:25, and previous content file). bn display end time 12:05:25) is stored (see FIG. 15C).

(Confirm content file acquisition operation)
In step S1121, the mobile terminal A includes information indicating the generation time of the “content file owner inquiry message” for the display device D (that is, the operation start time 12:05:23 for acquiring the content file). Send “content file owner inquiry message”. At this time, as indicated by an arrow in the figure, in the mobile terminal A, the user operation for acquiring the content file is confirmed. That is, in step S1121, this “content file owner inquiry message” is transmitted from the portable terminal A to the display device D. In step S1121, the portable terminal A cannot identify the content file and the owner displayed on the display device D.

(Identification of content file)
In step S1123, the display device D starts an operation for acquiring a content file in step S1116 based on the generation time of the “content file owner inquiry message” specified in the “content file owner inquiry message”. The owner (mobile terminal B) of the content file displayed at the time is specified.

  In step S1125, the display device D displays the owner of the content file (mobile terminal B) displayed during the generation time of the “content file owner inquiry message” (that is, the time when the operation for acquiring the content file is started). "Content file owner inquiry response message" is transmitted to the portable terminal A.

  In step S1127, based on the “content file owner inquiry response message” received from the display device D, the mobile terminal A transmits a “content file acquisition request message” to the mobile terminal B that is the owner of the corresponding content file. To do.

  In step S <b> 1129, the mobile terminal B identifies the corresponding content file bn based on the “content file acquisition request message” received from the mobile terminal A.

  In step S1131, the mobile terminal B transmits the identified content file bn to the mobile terminal A.

  As described above, in the present embodiment, in order to acquire a desired content file, a user holding the desired content file is specified, or a folder hierarchical structure is searched without performing a cumbersome operation for the user. By a simple user operation, the mobile terminal A acquires the content file displayed on the display device D when the content file acquisition operation is actually started from the owner (mobile terminal B) of the content file. Can do.

  FIG. 12 is an example of a communication system in the present embodiment.

  The outline of the operation of the communication system will be described with reference to FIG. Here, the mobile terminal A, the mobile terminal B, the mobile terminal C, and the display device D are DLNA compatible devices. The mobile terminal A, the mobile terminal B, and the mobile terminal C can display the content file owned by each mobile terminal on the display device D within the local network. In addition, content files owned by each mobile terminal can be shared within a local network formed by the mobile terminal A, the mobile terminal B, the mobile terminal C, and the display device D.

  In the communication system shown in FIG. 12, the portable terminal B transmits the content file it owns to the display device D (step S1201), and the display device D displays the content file (step S1202). The mobile terminal A transmits (broadcasts) a message inquiring about the owner of the content file being displayed to the local network (step S1203). And each portable terminal B, C, and the display apparatus D notify the display start time of the content file being displayed to the portable terminal A as the inquiry result (step S1205). Based on the display start time of the content file, the mobile terminal A transmits a content file acquisition request message for acquiring the content file being displayed on the display device D to the mobile terminal B that is the owner of the content file (step S1207). . Based on this acquisition request message, the mobile terminal B transmits the content file being displayed on the display device D to the mobile terminal A (step S1209).

  Next, operation examples 10 and 11 of the communication system shown in FIG. 12 will be described with reference to FIGS.

<Operation example 10>
With reference to FIG. 13, the operation example 10 in the communication system which concerns on this Embodiment shown in FIG. 12 is demonstrated.

  With reference to FIG. 13, an example of the content file acquisition operation in the present embodiment will be described.

  In FIG. 13, the content file is simply expressed as a file. The portable terminal A holds a content file a1 (denoted as file a1 in the figure) and a content file an (denoted as file an in the figure), and the portable terminal B represents a content file b1 (denoted as file b1 in the figure). ) And content file bn (denoted as file bn in the figure), and portable terminal C retains content file c1 (denoted as file c1 in the figure) and content file cn (denoted as file cn in the figure). Shall.

  In addition, the arrow surrounding the oblique line shown in FIG. 13 shows user operation. For example, an operation for transmitting a content file to the display device D and an operation for acquiring a content file being displayed on the display device D (or displayed in the past).

  Although FIG. 13 illustrates an example of an operation in which the mobile terminal A acquires a content file being displayed on the display device D, the same operation can be performed in either of the mobile terminals B and C.

  FIG. 13 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S1301, the portable terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D. At the time of this transmission, the portable terminal A stores information (content file name and display start time 11:55:00) of the content file a1.

  In step S1303, the display apparatus D displays the content file a1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A.

  In step S1305, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D. At the time of this transmission, the portable terminal C stores information (content file name and display start time 11:59:10) of the content file c1.

  In step S1307, the display device D displays the content file c1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C.

  In step S1309, the portable terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D. At the time of this transmission, the portable terminal B stores the information of the content file b1 (content file name and display start time 11:59:20).

  In step S 1307, the display device D displays the content file b 1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B.

  In step S1313, the mobile terminal A transmits the content file an to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file an on the display device D. At the time of this transmission, the portable terminal A overwrites the information of the content file an stored in the information of the content file an (content file name and display start time 12:00:00).

  In step S1315, the display device D displays the content file an of the mobile terminal A based on the “content file display request message” received from the mobile terminal A.

  In step S1317, the portable terminal C transmits the content file cn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file cn on the display device D. At the time of this transmission, the portable terminal C overwrites the information of the content file c1 that stores the information of the content file cn (content file name and display start time 12:00:10).

  In step S <b> 1319, the display device D displays the content file cn of the mobile terminal C based on the “content file display request message” received from the mobile terminal C.

  In step S1321, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D. At the time of this transmission, the portable terminal B overwrites the information of the content file b1 that stores the information of the content file bn (content file name and display start time 12:00:20).

  In step S1323, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B.

(Content file acquisition process)
In steps S1325, S1327, and S1329, the portable terminal A sends a “content file owner inquiry message” to each of the portable terminals B, C, and C in the local network in order to acquire the content currently displayed on the display device D. And broadcast to the display device D. At the time of this transmission, the portable terminal A stores the time (12:00:25) when this “content file owner inquiry message” is generated as the content file acquisition operation start time. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A is currently performing a user operation for acquiring a content file being displayed on the display device D. In steps S1325, S1327, and S1329, the portable terminal A cannot identify the content file displayed on the display device D and the owner.

  In step S1331, the portable terminal B transmits a “content file owner inquiry response message” including the information of the content file bn (content file name and display start time 12:00:20) to the portable terminal A.

  In step S 1333, the portable terminal C transmits to the portable terminal A a “content file owner inquiry response message” that includes the information of the content file cn (content file name and display start time 12:00:10).

  In step S1335, the display device D transmits a “content file owner inquiry response message” including the display start time (00:00:00) and the content file name (NULL) to the mobile terminal A. In this case, since the display device D does not hold information on the content file, the display device D transmits NULL to the portable terminal A as 00:00:00 as the display start time and as the content file name.

  In step S1337, the mobile terminal A stores the content file information included in the “content file owner inquiry response message” received from each of the mobile terminals B and C and the display device D, and the “content” stored in its own terminal. The content file bn displayed on the display device D is specified from the time (12:00:25) when the “file owner inquiry message” is generated to the time (12:00:25) when the content file acquisition operation is started. can do. In step S1339, the mobile terminal A transmits a “content file acquisition request message” to the mobile terminal B that is the owner in order to acquire the specified content file bn.

  In step S1341, the mobile terminal B transmits the content file bn to the mobile terminal A as a response to the “content file acquisition request message”.

  As described above, in the present embodiment, in order to acquire a desired content file, a user holding the desired content file is specified, or a folder hierarchical structure is searched without performing a cumbersome operation for the user. By a simple user operation, the mobile terminal A acquires the content file displayed on the display device D when the content file acquisition operation is actually started from the owner (mobile terminal B) of the content file. Can do.

  In the operation example 10 shown in FIG. 13, when another content file is displayed on the display device D while another content file is being displayed on the display device D, the display device D functions as a display stop notification. It is possible that a message is sent. For example, in step S1307, when the display device D displays the content file c1 of the mobile terminal C, the display device D transmits a message that functions as a display stop notification to the mobile terminal A. In step S1331, step S1333, and step S1335, if the content file of the terminal itself is being displayed on the display device D, a “content file owner inquiry response message” including the latest display start time in the content file information. May be transmitted. If the content file of the own terminal is not being displayed on the display device D, a “content file owner inquiry response message” including 00:00:00 in the content file information may be transmitted.

  In the present embodiment, the display start time (00) included in the “content file owner inquiry response message” transmitted by the display device D and the mobile terminal whose content file of the own terminal is not being displayed on the display device D. : 00: 00) and the content file name (NULL) are examples, and the present invention is not limited thereto.

<Operation example 11>
With reference to FIG. 14, an operation example 11 in the communication system according to the present embodiment shown in FIG. 12 will be described.

  In FIG. 14, the content file is simply expressed as a file. The portable terminal A holds a content file a1 (denoted as file a1 in the figure) and a content file an (denoted as file an in the figure), and the portable terminal B represents a content file b1 (denoted as file b1 in the figure). ), Content file bn (denoted as file bn in the figure) and content file bn + 1 (denoted as file bn + 1 in the figure). It is assumed that a file cn is represented in the figure.

  In addition, the arrow surrounding the oblique line shown in FIG. 14 shows user operation. For example, an operation for transmitting a content file to the display device D and an operation for acquiring a content file being displayed on the display device D (or displayed in the past).

  In FIG. 14, the operation of acquiring the content file being displayed on the display device D by the mobile terminal A will be described as an example.

  FIG. 14 is a diagram illustrating an example of an operation for the mobile terminal A to acquire a content file being displayed on the display device D, and the operation of the mobile terminal A is not limited to this.

  In step S1401, the portable terminal A transmits the content file a1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file a1 on the display device D. At the time of this transmission, the portable terminal A stores the information of the content file a1 (content file name, content file display start time 11:50:00).

  In step S1403, the display device D displays the content file a1 of the mobile terminal A based on the “content file display request message” received from the mobile terminal A.

  In step S1405, the portable terminal C transmits the content file c1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file c1 on the display device D. At the time of this transmission, the portable terminal C stores information on the content file c1 (content file name, content file display start time 11:50:10).

  In step S1407, the display device D displays the content file c1 of the mobile terminal C based on the “content file display request message” received from the mobile terminal C.

  In step S1409, the portable terminal B transmits the content file b1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file b1 on the display device D. At the time of this transmission, the mobile terminal B stores information on the content file b1 (content file name, content file display start time 11:50:20).

  In step S1411, the display device D displays the content file b1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B.

  In step S1413, the portable terminal A transmits the content file an to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal A performs a user operation for displaying the content file an on the display device D. At the time of this transmission, the portable terminal A stores the information of the content file an (content file name, content file display start time 12:00: 00) in addition to the information of the content file a1.

  In step S1415, the display device D displays the content file an of the mobile terminal A based on the “content file display request message” received from the mobile terminal A.

  In step S1417, the portable terminal C transmits the content file cn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal C performs a user operation for displaying the content file cn on the display device D. At the time of this transmission, the portable terminal C stores the information of the content file cn (content file name, content file display start time 12:00:10) in addition to the information of the content file c1.

  In step S1419, the display device D displays the content file cn of the portable terminal C based on the “content file display request message” received from the portable terminal C.

  In step S1421, the portable terminal B transmits the content file bn to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn on the display device D. At the time of this transmission, the portable terminal B stores the information of the content file bn (content file name, content file display start time 12:00:20) in addition to the information of the content file b1.

  In step S <b> 1423, the display device D displays the content file bn of the mobile terminal B based on the “content file display request message” received from the mobile terminal B.

(Start of content file acquisition operation)
In step S1424, the mobile terminal A generates a “content file owner inquiry message” for the other mobile terminals B and C and the display device D (that is, the operation start time 12:00 for acquiring the content file). : 23), a “content file owner inquiry message” is generated. At the time of this generation, the portable terminal A stores the time (12:00:23) when this “content file owner inquiry message” is generated as the content file acquisition operation start time. At this time, as indicated by an arrow in the figure, in the portable terminal A, a user operation for acquiring a content file has been started, but has not yet been confirmed. That is, in step S 1424, the content file acquisition process is started, but this “content file owner inquiry message” is not transmitted from the mobile terminal A to the other mobile terminals B and C and the display device D.

(Interrupt (user operation))
In step S1425, the portable terminal B transmits the content file bn + 1 to the display device D together with the “content file display request message”. At the time of this transmission, as indicated by an arrow in the figure, the mobile terminal B performs a user operation for displaying the content file bn + 1 on the display device D. At the time of this transmission, the display device D stores information on the content file bn + 1 (content file name, content file display start time 12:00:30) in addition to the information on the content files b1 and bn.

  In step S1427, the display device D displays the content file bn + 1 of the mobile terminal B based on the “content file display request message” received from the mobile terminal B.

(Confirm content file acquisition operation)
In Steps S1429, S1431, and S1433, the mobile terminal A generates the “content file owner inquiry message” generation time (that is, an operation for acquiring the content file) for the other mobile terminals B and C and the display device D. A “content file owner inquiry message” including information indicating time 12:00:23) is transmitted. At this time, as indicated by an arrow in the figure, in the mobile terminal A, the user operation for acquiring the content file is confirmed. That is, in steps S1429, S1431, and S1433, the “content file owner inquiry message” is broadcast (broadcast) from the portable terminal A to the other portable terminals B and C and the display device D. In step S1429, step S1431, and step S1433, the mobile terminal A cannot identify the content file displayed on the display device D and the owner.

  In step S1435, the mobile terminal B displays the content file name (content file bn) displayed at the generation time of the “content file owner inquiry message” (that is, the operation start time 12:00:23 for acquiring the content file). ) And a “content file owner inquiry response message” indicating the display start time are transmitted to the portable terminal A.

  In step S1437, the mobile terminal C displays the content file name (content file cn) displayed during the generation time of the “content file owner inquiry message” (that is, the operation start time 12:00:23 for acquiring the content file). ) And a “content file owner inquiry response message” indicating the display start time are transmitted to the portable terminal A.

  In step S1439, display device D transmits to mobile terminal A a “content file owner inquiry response message” indicating the content file name (NULL) and its display start time (00:00:00). In this case, since the display device D does not hold information on the content file, the display device D transmits NULL to the portable terminal A as 00:00:00 as the display start time and as the content file name.

(Identify owner of content file)
In step S1441, the mobile terminal A stores the content file information included in the “content file owner inquiry response message” received from each of the mobile terminals B and C and the display device D, and the “contents” stored in its own terminal. The content file bn displayed on the display device D is specified from the time (12:00:23) when the “file owner inquiry message” is generated to the time (12:00:23) when the content file acquisition operation is started can do.
In step S1443, the mobile terminal A transmits a “content file acquisition request message” to the mobile terminal B that is the owner of the identified content file bn.

  In step S <b> 1445, the mobile terminal B transmits the corresponding content file bn to the mobile terminal A based on the “content file acquisition request message” received from the mobile terminal A.

  As described above, in the present embodiment, in order to acquire a desired content file, a user holding the desired content file is specified, or a folder hierarchical structure is searched without performing a cumbersome operation for the user. By a simple user operation, the mobile terminal A acquires the content file displayed on the display device D when the content file acquisition operation is actually started from the owner (mobile terminal B) of the content file. Can do.

  In the operation example 11 shown in FIG. 14, when another content file is displayed on the display device D while another content file is being displayed on the display device D, the display device D functions as a display stop notification. It is possible that a message is sent. For example, in step S1407, when the display device D displays the content file c1 of the mobile terminal C, the display device D transmits a message that functions as a display stop notification to the mobile terminal A. In step S1435, step S1437, and step S1439, if the content file of the terminal is being displayed on the display device D, a “content file owner inquiry response message” including the latest display start time in the content file information. May be transmitted. If the content file of the own terminal is not being displayed on the display device D, a “content file owner inquiry response message” including 00:00:00 in the content file information may be transmitted.

  In the present embodiment, the display start time (00) included in the “content file owner inquiry response message” transmitted by the display device D and the mobile terminal whose content file of the own terminal is not being displayed on the display device D. : 00: 00) and the content file name (NULL) are examples, and the present invention is not limited thereto.

  In the operation examples 1 to 11 of the above embodiment, the mobile terminal A and the display device D are described separately. However, the mobile terminal and the display device having both functions of the mobile terminal A and the display device D are described. But it is feasible.

  With reference to FIGS. 16A and 16B, a user interface operation for displaying a content file and acquiring a content file in the present embodiment will be described. In FIGS. 16A and 16B, an example in which a user operation is performed on the touch panel will be described. However, in the present embodiment, the user operation is not limited to the operation on the touch panel.

  FIG. 16A shows a user operation for making a content file playback request (Push) from the content file providing side (mobile terminals A, B, C) to the content file playing side (display device D). Show. This is a user operation corresponding to the Push operation used in normal DLNA. For example, the user operation corresponding to the Push operation can be realized by sliding the icon 1603 of the display content file on the touch panel 1610 in the direction indicated by the arrow 1601 in the drawing (the direction toward the display device D).

  FIG. 16B shows a content file owner inquiry and a content file acquisition request (GET) from the content file providing side (mobile terminals A, B, C) to the content file reproducing side (display device D). ) Shows a user operation for performing (). This can be realized by extending a command used for DLNA. For example, the user operation corresponding to the content file owner inquiry and the content file acquisition request (GET) is performed on the touch panel 1610 of the mobile terminal A when the content file data 1607 is displayed on the display device D. This can be realized by sliding the user's finger 1609 in the direction indicated by the arrow 1605 in the figure (front side when viewed from the user).

  The content file owner inquiry and the content file acquisition request (GET) are started when the user's finger 1609 touches the touch panel 1610 (for example, step S416 in FIG. 4, step S816 in FIG. 8, Step S1116 in FIG. 11 and step S1424 in FIG. 14 are determined when the user's finger 1609 finishes sliding in the direction indicated by the arrow 1605 in the drawing (front side when viewed from the user) (for example, step S421 in FIG. 4, FIG. 8 step S821, FIG. 11 step S1121, FIG. 14 steps S1429, 1431 and 1433). That is, while the user's finger 1609 moves after touching on the touch panel 1610, the content file owner inquiry and the content file acquisition request (GET) are not transmitted from the mobile terminal A. Note that the message is not transmitted while the user's finger moves after touching on the touch panel, and the present invention is not limited to this.

  The communication system and the communication method according to the present invention have an effect that a desired content file can be acquired by a simple user operation, and are useful as a communication system, an electronic device, and the like using DLNA.

103 input processing unit 105 DLNA processing unit 107 communication control unit 109 owner inquiry processing unit 111 operation start time storage unit 501 communication control unit 503 DLNA processing unit 505 display control unit 507 content file information storage unit 509 inquiry file determination unit 511 display unit 1610 Touch panel A, B, C Mobile terminal D Display device

Claims (16)

In a communication system in which the first and second portable terminals and the display device are connected to each other via a network,
The first portable terminal is
The content file owned by the terminal is transmitted to the display device,
The display device
Sequentially displaying the content files received from the first portable terminal; and
Holds the content file information indicating the file name of the currently displayed content file and the currently displayed content file,
The second portable terminal is
Transmitting an acquisition request message for acquiring a content file currently displayed on the display device to the display device, and acquiring a corresponding content file from the display device as a response to the acquisition request message;
Communications system. In a communication system in which the first and second portable terminals and the display device are connected to each other via a network,
The first portable terminal is
The content file owned by the terminal is transmitted to the display device,
The display device
Sequentially displaying the content files received from the first portable terminal; and
Holds the currently displayed content file, the file name of the content file displayed in the past, the content file information indicating the display order, and the currently displayed content file,
The second portable terminal is
An acquisition request message for acquiring a content file displayed by a predetermined amount from the content file currently displayed on the display device is transmitted to the display device, and the corresponding content file is sent as a response to the acquisition request message. Obtaining from the display device;
Communications system. In a communication system in which the first and second portable terminals and the display device are connected to each other via a network,
The first portable terminal is
The content file owned by the terminal is transmitted to the display device,
The display device
Sequentially displaying the content files received from the first portable terminal; and
The content file currently displayed, the display start time and the display end time of the content file displayed in the past, the content file information indicating the file name, and the content file currently displayed are retained.
The second portable terminal is
The acquisition request message for acquiring the content file displayed on the display device at the generation time of the content file acquisition request message on the display device is transmitted to the display device, and the response corresponds to the acquisition request message. Obtaining a content file from the display device;
Communications system. In a communication system in which the first and second portable terminals and the display device are connected to each other via a network,
The first portable terminal is
The content file owned by the terminal is transmitted to the display device,
The display device
Sequentially displaying the content files received from the first portable terminal; and
Holds content file information indicating the owner and file name of the currently displayed content file,
The second portable terminal is
An inquiry message for inquiring about the owner of the content file currently displayed on the display device is transmitted to the display device, and information indicating the owner and file name of the corresponding content file is transmitted from the display device as a response to the inquiry message. Acquired,
Based on the response of the inquiry message, an acquisition request message for acquiring the corresponding content file is transmitted to the first portable terminal, and the corresponding content file is transmitted as the response of the acquisition request message to the first portable terminal. To get from
Communications system. In a communication system in which the first and second portable terminals and the display device are connected to each other via a network,
The first portable terminal is
The content file owned by the terminal is transmitted to the display device,
The display device
Sequentially displaying the content files received from the first portable terminal; and
Holds the content file information indicating the owner of the currently displayed content file and the content file displayed in the past, the file name, and the display order,
The second portable terminal is
An inquiry message for inquiring about the owner of the content file displayed by a predetermined amount from the content file currently displayed on the display device is sent to the display device, and the owner of the corresponding content file is returned as a response to the inquiry message. And information indicating the file name is acquired from the display device,
Based on the response of the inquiry message, an acquisition request message for acquiring the corresponding content file is transmitted to the first portable terminal, and the corresponding content file is transmitted as the response of the acquisition request message to the first portable terminal. To get from
Communications system. In a communication system in which the first and second portable terminals and the display device are connected to each other via a network,
The first portable terminal is
The content file owned by the terminal is transmitted to the display device,
The display device
Sequentially displaying the content files received from the first portable terminal; and
Holds the content file information indicating the display start time and display end time of the currently displayed content file and the content file displayed in the past, the owner, and the file name,
The second portable terminal is
An inquiry message for inquiring about the owner of the content file displayed on the display device at the generation time of the content file owner inquiry message on the display device is transmitted to the display device, and the corresponding content is returned as a response to the inquiry message. Obtaining information indicating the owner and file name of the file from the display device;
Based on the response of the inquiry message, an acquisition request message for acquiring the corresponding content file is transmitted to the first portable terminal, and the corresponding content file is transmitted as the response of the acquisition request message to the first portable terminal. To get from
Communications system. In a communication system in which the first and second portable terminals and the display device are connected to each other via a network,
The first portable terminal is
A content file owned by the terminal is transmitted to the display device; and
Holding content file information indicating the display start time on the display device and the file name of the displayed content file;
The display device
Sequentially displaying the content files received from the first portable terminal;
The second portable terminal is
An inquiry message for inquiring about the owner of the content file currently displayed on the display device is broadcast in the network, and
Holding information indicating the generation time of the inquiry message;
The first portable terminal and the display device are:
In response to the owner inquiry message, the content file display information indicating the display start time and file name of the content file held in the terminal is transmitted to the second portable terminal,
The second portable terminal is
Based on the content file information received from the first portable terminal and the display device and the generation time of the inquiry message, the content file displayed on the display device immediately before the generation time of the inquiry message is identified,
Transmitting an acquisition request message for acquiring the specified content file to the first mobile terminal, and acquiring the corresponding content file from the first mobile terminal as a response to the acquisition request message;
Communications system. In a communication system in which the first and second portable terminals and the display device are connected to each other via a network,
The first portable terminal is
A content file owned by the terminal is transmitted to the display device; and
Holding content file information indicating the display start time on the display device and the file name of the displayed content file;
The display device
Sequentially displaying the content files received from the first portable terminal;
The second portable terminal is
An inquiry message for inquiring about the owner of the content file displayed on the display device at the generation time of the content file owner inquiry message on the display device is simultaneously transmitted in the network, and
Holding information indicating the generation time of the inquiry message;
The first portable terminal and the display device are:
In response to the owner inquiry message, the content file information indicating the display start time and file name of the content file held in the terminal immediately before the generation time of the inquiry message is transmitted to the second portable terminal. And
The second portable terminal is
Based on the content file information received from the first portable terminal and the display device and the generation time of the inquiry message, the content file displayed on the display device immediately before the generation time of the inquiry message is identified,
Transmitting an acquisition request message for acquiring the specified content file to the first mobile terminal, and acquiring the corresponding content file from the first mobile terminal as a response to the acquisition request message;
Communications system. A communication method in a communication system in which first and second portable terminals and a display device are connected to each other via a network,
The first portable terminal transmits a content file owned by the terminal to the display device;
The display device sequentially displays the content file received from the first portable terminal, and holds the content file information indicating the file name of the currently displayed content file and the currently displayed content file; ,
The second portable terminal transmits an acquisition request message for acquiring a content file currently being displayed on the display device to the display device, and sends the corresponding content file as a response to the acquisition request message. A step of obtaining from
Communication method. In a communication system in which the first and second portable terminals and the display device are connected to each other via a network,
The first portable terminal transmits a content file owned by the terminal to the display device;
The display device sequentially displays the content file received from the first portable terminal, and holds the content file information indicating the owner and file name of the currently displayed content file;
The second portable terminal transmits an inquiry message for inquiring about the owner of the content file currently displayed on the display device to the display device, and, as a response to the inquiry message, the owner of the corresponding content file and the file name Obtaining information from the display device;
The second portable terminal transmits an acquisition request message for acquiring the corresponding content file to the first portable terminal based on the response of the inquiry message, and the corresponding content is transmitted as a response of the acquisition request message. Obtaining a file from the first mobile terminal.
Communication method. A communication method in a communication system in which first and second portable terminals and a display device are connected to each other via a network,
The first portable terminal transmits to the display device a content file owned by the terminal, and displays content file information indicating a display start time and a file name of the displayed content file on the display device. Holding step;
The display device sequentially displays the content files received from the first portable terminal;
The second portable terminal simultaneously transmits an inquiry message inquiring about an owner of a content file currently displayed on the display device into the network, and holds information indicating a generation time of the inquiry message; ,
In response to the owner inquiry message, the first portable terminal and the display device receive content file information indicating the content file display start time and file name held in the own terminal as the second portable terminal. Sending to
The second portable terminal is displayed on the display device immediately before the generation time of the inquiry message based on the content file information received from the first portable terminal and the display device and the generation time of the inquiry message. Identifying the content file
The second mobile terminal transmits an acquisition request message for acquiring the specified content file to the first mobile terminal, and sends the corresponding content file as a response to the acquisition request message. Obtaining from the terminal,
Communication method. Display means for displaying a content file transmitted from the first portable terminal;
Content file information storage means for holding information for specifying the content file;
Communication means for transmitting information identifying the content file to the second portable terminal in response to an inquiry message transmitted from the second portable terminal;
A display device comprising:   When the communication means receives the inquiry message from the second portable terminal, the communication means sends information specifying the content file corresponding to the content file displayed on the display means to the second portable terminal. The display device according to claim 12 for transmission.   The display device according to claim 12 or 13, wherein the information specifying the content file is information relating to an owner of the content file.   15. The display device according to claim 12, wherein the information specifying the content file is information related to a display time of the content file.   An electronic apparatus comprising the display device according to any one of claims 12 to 15.

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