JP6427475B2 - Display control apparatus, display control method, display control program, and content display system - Google Patents

Description

  The present invention relates to a display control device, a display control method, a display control program, and a content display system for controlling display of content data mounted on a mobile body and acquired from a content providing server on a display device mounted on the mobile body. .

  In general, on a bus or train that carries passengers to a desired destination, advertisements, route information, etc. are displayed for passengers to view. Along with the recent development of information devices, in trains, advertisements, route information, and the like are being displayed as content data not only on paper media but also on electronic display devices such as liquid crystal displays.

  When such a display device displays content, there is a method in which a content provider specifies a communication method used for downloading content (see, for example, Patent Document 1). According to the method described in Patent Document 1, a terminal receiving content provision acquires a communication method used for content download from the content providing side, and downloads the content according to the communication method.

JP 2007-34810 A

  Since the content is changed according to the time and situation, when content data is displayed on a moving body, a method of replacing the content in a train or bus garage can be considered. However, in this method, when a train or bus is away from the garage, there is a possibility that the content cannot be acquired smoothly in a timely manner according to the occurrence of a disaster or bad weather. In addition, since the content has various data formats such as still images and moving images with different compression rates as well as text data, it takes time to download the content, and there is a possibility that the content cannot be acquired smoothly in a timely manner. is there.

  As described above, the problem that the content cannot be appropriately acquired becomes remarkable on the bus. For example, a train has an infrastructure for wireless communication and cable communication in advance, and there is a possibility that content can be received smoothly using a part of the band. However, since such a facility is not provided on the bus, it is necessary to take measures to register the content in advance, and the content may not be acquired smoothly. Furthermore, in the case of a bus, the route is complicated, and it is required to provide content that depends on the location of the bus, instead of content display that is unified for all vehicles. In addition, the bus route is not fixed all day, and the bus may operate a plurality of routes in one day. Therefore, in the case of a bus, there is a particularly high demand for acquiring only the content necessary for operation at an appropriate timing.

  Accordingly, an object of the present invention is to provide a display control device, a display control method, a display control program, and a content display system that can smoothly acquire content in a moving body.

  In order to solve the above-described problem, a first feature of the present invention is that a display control device is mounted on a mobile body and controls display of content data acquired from a content providing server on a display device mounted on the mobile body. About. A display control apparatus according to the first aspect of the present invention includes a wireless communication interface connected to a content providing server via a wireless communication network, a mobile communication interface connected to the content providing server via a mobile communication network, Whether to transmit a test packet to the content providing server via at least one of the wireless communication interface and the mobile communication interface, and to communicate with the wireless communication interface or the mobile communication interface based on the result of transmitting the test packet Content acquisition means for requesting data related to the display of the content data from the content providing server via the determined communication interface and acquiring data from the content providing server.

  The content acquisition means requests the playlist data specifying the content data to be displayed on the display device from the content providing server via the determined communication interface, receives the playlist data from the content providing server, and uses the playlist data. Among the specified content data, the content data that is not stored in the display control device is specified, the specified content data is requested from the content providing server, and the specified content data is acquired from the content providing server. Also good.

  The content acquisition means requests the data by specifying the data amount per packet from the content providing server, and the data amount when acquiring the data via the wireless communication interface is acquired via the mobile communication interface. It may be larger than the amount of data in the case.

  The playlist data associates an identifier of the content data with a condition including at least one of the position, time, normal time, or emergency of the mobile object that displays the content data. Referring to FIG. 5, content display means for causing the display device to display content data that meets the conditions may be further provided.

  A second feature of the present invention relates to a display control method in which a display control device mounted on a moving body controls display of content data acquired from a content providing server on a display device mounted on the moving body. In the display control method according to the second aspect of the present invention, the display control device connects to the content providing server via the wireless communication interface connected to the content providing server via the wireless communication network and the mobile communication network. A mobile communication interface, wherein the display control device transmits a test packet to the content providing server via at least one of the wireless communication interface and the mobile communication interface; and the display control device transmits the test packet. Based on the result, the step of determining whether to communicate with the wireless communication interface or the mobile communication interface, and the display control device uses the determined communication interface to display data related to the display of content data on the content providing server A step of requesting, the display control device, from the content providing server, comprising the steps of acquiring data.

  A third feature of the present invention relates to a display control program for causing a computer to function as the means described in the first feature of the present invention.

  A fourth feature of the present invention is a content providing server that provides content data, and a display that is mounted on a mobile body and that controls display of content data acquired from the content providing server on a display device mounted on the mobile body. The present invention relates to a content display system including a control device. In the content display system according to the fourth aspect of the present invention, the display control device includes a wireless communication interface connected to the content providing server via the wireless communication network, and a mobile connected to the content providing server via the mobile communication network. A test packet is transmitted to the content providing server via the communication interface and at least one of the wireless communication interface and the mobile communication interface, and one of the wireless communication interface and the mobile communication interface is determined based on the result of transmitting the test packet. Content that determines whether to communicate with the server, requests data related to display of content data from the content providing server via the determined communication interface, and acquires data from the content providing server It provided the resulting unit. In the content display system according to the fourth aspect of the present invention, when the content providing server receives the test packet, the content providing server transmits a message indicating that the content has been received to the display control device, and processing means for transmitting data in response to the data request. Prepare.

  According to the present invention, it is possible to provide a display control device, a display control method, a display control program, and a content display system capable of acquiring content in a timely manner on a mobile body.

It is a figure explaining the system configuration | structure of the content display system which concerns on embodiment of this invention. It is a figure explaining the hardware constitutions and functional block of the display control apparatus which concern on embodiment of this invention. It is a figure explaining an example of data structure and data of playlist data concerning an embodiment of the invention. It is a flowchart explaining the display control method which concerns on embodiment of this invention. It is a flowchart explaining the process which acquires content in the display control method which concerns on embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

(Content display system)
A content display system 8 according to an embodiment of the present invention includes a display device 2 and a speaker 3 mounted on a bus 7, a content providing server 4 that provides content data, and a content providing server 4 that is mounted on the bus 7. And a display control device 1 that controls the display of the acquired content data on the display device 2. The display device 2 is a so-called digital signage that displays content data referred to by passengers and the like who get on the moving body. In the embodiment of the present invention, the bus 7 is a kind of mobile body. The display control device 1 according to the embodiment of the present invention is not limited to the bus 7 and may be mounted on various moving bodies such as a passenger car, a taxi, and a train.

  The display control device 1 and the content providing server 4 are connected to be able to communicate with each other through a plurality of communication routes via a plurality of communication networks. In the embodiment of the present invention, the plurality of communication networks are a wireless communication network 5 and a mobile communication network 6. The display control device 1 is connected to the content providing server 4 via the wireless communication access point 5a of the wireless LAN such as Wi-Fi and the wireless communication network 5. The display control device 1 is connected to the content providing server 4 via the mobile communication base station 6a and the mobile communication network 6 maintained by the communication carrier. Here, the wireless communication network 5 and the mobile communication network 6 may be connected to the content providing server 4 via a wired core network such as the Internet.

  The display control device 1 acquires the content data 13 from the content providing server 4 and inputs it to the display device 2 and the speaker 3. When content such as a moving image or a still image is input, the display device 2 displays or reproduces the content and outputs it. When content such as sound is input, the speaker 3 reproduces and outputs the content. As a result, passengers on the bus 7 can view the content.

  The content includes, for example, information on the operation route of the bus 7 such as guidance of a stop where the bus 7 stops next, and information on an advertisement of a store on the route on which the bus 7 runs or an operating company. In addition, as content, when there is no disaster, information that informs the evacuation center in the vicinity of the bus travel location when the disaster occurs, and disaster prevention such as the congestion status of the evacuation center when the disaster actually occurs Information may be included. Further, the content may include news, weather information, train operation information, and the like.

  In the embodiment of the present invention, the information related to the operation route and advertisement of the bus 7 is a high-quality content because the information is periodically changed once a month or once a day and the content does not change every moment. Thus, it may be created as content such as a moving image having a relatively large data amount. News, weather forecasts, operation information indicating that the train is operating normally, etc. are transmitted and received during normal times, but change every moment and are preferably acquired at any time. Preferably it is created as a quantity of content. On the other hand, disaster prevention information when a disaster actually occurs, information on bad weather among the weather information, operation information indicating that the train is not operating normally are information that should be provided in real time, and passengers' interest Is expensive. Therefore, it is preferable that the content provided in real time is created as a still image with a relatively small amount of data so that it can be reliably acquired even in an emergency.

  In the embodiment of the present invention, in the bus 7, the communication status of the display control device 1 always changes according to the position of the bus 7. Therefore, the display control device 1 transmits a test packet to the content providing server 4 to determine a communication interface used for communication with the content providing server 4. The display control device 1 confirms update of the playlist for reproducing the content or acquires new content data with the content providing server 4 via the determined communication interface.

  The content providing server 4 is realized by a general computer executing a display control program for realizing a predetermined function. The content providing server 4 stores content data and holds the identifier of the bus 7 and the playlist data provided to the bus 7 in association with each other. The playlist data 14 is a list for specifying content to be played back on the bus 7.

  The content providing server 4 includes a processing device (not shown) that processes data in accordance with a request from the display control device 1. When the content providing server 4 receives the test packet, the content providing server 4 replies that the test packet has been received or transmits the requested content data. Further, when the content providing server 4 receives the identifier of the bus 7 from the display control device 1, the content providing server 4 confirms the update of the playlist data on the bus 7, and if updated, returns the updated playlist data. In the content providing server 4, the playlist data may be updated as needed by the operator, or may be updated at a predetermined timing.

(Display control device)
With reference to FIG. 2, the display control apparatus 1 which concerns on embodiment of this invention is demonstrated. The display control device 1 is a general computer including a storage device 10 and a processing device 20. The display control apparatus 1 realizes each function shown in FIG. 2 by executing a program for a general computer to realize a predetermined function.

  The display control device 1 further includes a wireless communication interface 31 and a mobile communication interface 32. The wireless communication interface 31 is an interface for connecting to the content providing server 4 via the wireless communication network 5. The wireless communication interface 31 is, for example, a network chip for Wi-Fi wireless communication.

  The mobile communication interface 32 is an interface for connecting to the content providing server 4 via the mobile communication network 6. The mobile communication interface 32 is, for example, a SIM (Subscriber Identity Module Card).

  The storage device 10 stores position information data 11, mode data 12, content data 13, playlist data 14, and selected network data 15.

  The position information data 11 is information that can specify the position of the bus 7 acquired by the position information acquisition unit 21. The position of the bus 7 based on the position information data 11 may be specified as latitude / longitude information by GPS (Global Positioning System) or specified by information input by the bus driver, such as passing through a predetermined stop. Also good.

  The mode data 12 is one piece of information for specifying the content to be displayed on the display device 2. In the mode data 12, for example, when content to be displayed is changed between a normal time and an emergency time, information specifying either a normal time or an emergency time is set in the mode data 12. Here, normal is, for example, a situation in which no disaster, bad weather, train delay, etc. have occurred, and in an emergency, it refers to the situation in which these occur, but it is set appropriately in the content data and the system to be implemented May be. In addition to the normal mode or the emergency mode, other modes such as a severe disaster may be set.

  The content data 13 is data input to the display device 2 and the speaker 3 and is provided from the content providing server 4. The content data 13 may be an aggregate of a plurality of content data.

  The playlist data 14 is data in which content data output to the display device 2 and the speaker is associated with an output condition. The playlist data 14 may be set according to the operation route of the bus 7.

  As shown in FIG. 3, the playlist data 14 is data in which a condition for outputting content is associated with information on the content to be output. The conditions for outputting the content include the position of the bus 7, a mode indicating normal or emergency, time indicating morning, noon, night, and the like. The output content information includes an identifier of content data output to the display device 2, an identifier of content data output to the speaker 3, and the like. Here, setting information such as a volume at the time of outputting content, such as increasing the sound in an emergency, may be associated.

  If no condition is set in the playlist data 14, it may indicate that content is output regardless of the condition. Moreover, it is not necessary to set both the identifier of the content data input to the display device 2 and the identifier of the content data input to the speaker 3 for the predetermined condition, and either one may be set. Further, as shown in FIG. 3, the information on the bus position may be specified according to the operation route of the bus 7, or may be specified based on latitude / longitude information or the like.

  Further, when outputting a plurality of content data under a predetermined condition, the content data identifier may be associated with the content data output order.

  The selected network data 15 includes a communication network identifier used by the display control device 1 for connection to the content providing server 4. In the embodiment of the present invention, the identifier of either the wireless communication network 5 or the mobile communication network 6 determined to be used for data download by the network confirmation unit 25 described later is set in the selected network data 15. .

  The processing device 20 includes position information acquisition means 21, mode acquisition means 22, content display means 23, and content acquisition means 24.

  The position information acquisition unit 21 acquires the current position of the bus 7 at any time or at a predetermined timing, and updates the position information data 11. The position information acquisition means 21 is a GPS receiver, and the position of the bus 7 may be specified by latitude and longitude information. The position information acquisition means 21 may measure the current position of the bus 7 by inputting an instruction from the bus driver when passing through a predetermined stop.

  The mode acquisition unit 22 acquires a condition for specifying content to be displayed on the display device 2 and sets it in the mode data 12. For example, when the mode acquisition unit 22 sets “normal” in the mode data 12 and detects that it is “emergency” by accessing the content providing server 4, the mode acquisition unit 22 sets “emergency” in the mode data 12. . The content providing server 4 holds mode settings input from the operator, that is, settings such as “normal” and “emergency”. Here, the display control device 1 periodically accesses the content providing server 4 to check whether or not the playlist data has been changed or whether or not the mode has been changed. When the display control device 1 detects that the mode has been changed, the mode is acquired. The means 22 acquires the changed mode and updates the mode data 12. In addition, although the case where the mode acquisition means 22 accesses the content provision server 4 and acquires a mode was demonstrated, it is not restricted to this. For example, when receiving an emergency signal, the mode acquisition means 22 may set “emergency” in the mode data 12, or set a predetermined mode in the mode data 12 according to the operation of the driver of the bus 7. May be set.

  The content display means 23 refers to the playlist data 14 and causes the display device 2 to display content data that meets the conditions. The content display means 23 refers to the position information data 11, the mode data 12, the system clock (not shown), etc., and specifies the conditions for displaying the content. Further, the content display means 23 refers to the playlist data 14 to identify the identifier of the content that meets the identified condition, reads the identified content from the content data 13 and inputs it to the display device 2 and the speaker 3, Output to the display device 2 and the speaker 3.

  The content acquisition unit 24 acquires the content data 13 and the playlist data 14 referred to by the display control device 1 from the content providing server 4. Specifically, the content acquisition unit 24 requests playlist data specifying content data to be output to the display device 2 and the speaker 3 from the content providing server 4, receives the playlist data 14 from the content providing server 4, and Store in the storage device 10. When requesting playlist data, the content acquisition unit 24 may transmit the identifier of the bus 7 to the content providing server 4 and acquire playlist data suitable for a bus route or the like.

  Further, the content acquisition unit 24 specifies content data that is not stored in the storage device 10 of the display control device 1 among the content data specified by the playlist data 14, and sends the specified content data to the content providing server 4. Request. The content acquisition unit 24 acquires the specified content data from the content providing server 4 and stores it in the storage device 10.

  Here, the content acquisition unit 24 connects to the content providing server 4 via the communication interface determined by the network confirmation unit 25 to be described later from the wireless communication interface 31 and the mobile communication interface 32 and acquires desired data. .

  The content acquisition unit 24 specifies the data amount per packet when requesting data from the content providing server 4. Here, the data amount when data is acquired via the wireless communication interface 31 is controlled to be larger than the data amount when data is acquired via the mobile communication interface 32. In general, the mobile communication network 6 tends to have a wide communication area while the communication band is narrow, and the wireless communication network 5 tends to have a limited communication area while the communication band is wide. Here, when the mobile communication network 6 is used, the data amount per packet is set small, and when the wireless communication network 5 is used, the data amount per packet is set large, so that the communication network Data can be reliably acquired according to characteristics.

  In particular, in the embodiment of the present invention, the information to be provided in an emergency changes every moment, is highly interested by passengers, and is generated with a small data size. Therefore, even in a location where the wireless communication network 5 cannot be used. Thus, it is possible to reliably acquire the information via the mobile communication network 6 and output it to the display device 2 or the speaker 3.

  The network confirmation unit 25 transmits a test packet to the content providing server 4 via at least one of the wireless communication interface 31 and the mobile communication interface 32, and based on the result of transmitting the test packet, the wireless communication interface 31 The mobile communication interface 32 determines whether to communicate. The content acquisition unit 24 requests data from the content providing server 4 via the communication interface determined by the network confirmation unit 25 and acquires data from the content providing server 4.

  The network confirmation unit 25 transmits data (test packet) having a predetermined data size such as 500 kilobytes via the wireless communication interface 31 and the wireless communication network 5 using a command to which the content providing server 4 responds. Specifically, the network confirmation unit 25 sets a data size such as 500 kilobytes in the PING command and transmits it to the content providing server 4 via the wireless communication interface 31 and the wireless communication network 5. Here, when receiving the PING command, the content providing server 4 responds to the PING command.

  When the network confirmation unit 25 normally receives a response from the content providing server 4, it determines that the wireless communication network 5 is operating normally. In this case, the network confirmation unit 25 updates the selected network data 15 so that the content acquisition unit 24 uses the wireless communication network 5.

  On the other hand, if a time-out occurs without receiving a response from the content providing server 4 within a predetermined time even after a predetermined number of retries, or if a response is received but it takes a long time to receive the network, etc. The means 25 determines that the wireless communication network 5 is not operating normally. In this case, the network confirmation unit 25 updates the selected network data 15 so that the mobile communication network 6 is used for the content acquisition unit 24.

  In the embodiment of the present invention, a case will be described in which the network confirmation unit 25 transmits a test packet only to the wireless communication network 5 and determines the operating status of the wireless communication network 5, but is not limited thereto. For example, the network confirmation unit 25 transmits a test packet to both the wireless communication network 5 and the mobile communication network 6, determines the network conditions of the wireless communication network 5 and the mobile communication network 6, respectively, and performs communication with good network conditions. The network may be determined and the selected network data 15 may be updated. If both communication network conditions are bad, the test packet may be transmitted again after a predetermined time. This is because the communication status may improve as the bus 7 moves as time elapses.

(Display control method)
With reference to FIG. 4, a display control method according to an embodiment of the present invention will be described.

  First, in step S <b> 1, the display control device 1 acquires content from the content providing server 4. In step S <b> 2, the display control device 1 acquires conditions for determining content to be output, such as position information of the bus 7, time, normal time or emergency.

  In step S3, the display control device 1 specifies the content to be displayed according to the condition acquired in step S2 from the content acquired in step S1, and displays the content on the display device 2. Until the bus 7 finishes the predetermined operation in step S4, the processes in steps S2 to S4 are repeated.

  In addition, the content acquisition process of step S1 may be performed sequentially while the bus 7 is operating.

  With reference to FIG. 5, the content acquisition processing according to the embodiment of the present invention will be described.

  First, in step S11, the display control apparatus 1 determines whether or not it is a content acquisition timing. For example, when content is acquired every 5 minutes, it is determined whether or not 5 minutes have passed since the previous acquisition. If it is not the acquisition timing, the process ends.

  In the case of acquisition timing, the display control apparatus 1 transmits a test packet to the content providing server 4 via the wireless communication interface 31 in step S12. In step S <b> 13, the display control device 1 determines whether to download the content according to the reception status of the reply of the test packet. If not downloaded, the process ends. When downloading content, in step S14, a communication line for downloading the content is determined. Furthermore, in step S15, the window size of the packet used for downloading, specifically, the data amount per packet is also determined.

  In step S <b> 16, the display control device 1 connects to the content providing server 4 and determines whether or not the playlist data 14 has been updated. If the playlist data 14 has not been updated, there is no content to be downloaded, and the process is terminated.

  If the playlist data 14 has been updated, the display control device 1 acquires new playlist data from the content providing server 4 and stores it in the storage device 10 in step S17.

  In step S18, the display control device 1 compares the content data stored in the storage device 10 with the content data specified by the playlist data 14, and determines whether there is content data to be downloaded. If there is no content data to be downloaded, the process is terminated as it is. If there is content data to be downloaded, in step S19, the display control device 1 downloads the content data from the content providing server 4 with the communication line specified by the determination in step S15 and step S17 and the data amount per packet.

  The display control apparatus 1 according to the embodiment of the present invention described above has a plurality of routes via different communication networks for connecting to the content providing server 4. When downloading the content data 13, the display control apparatus 1 transmits test data to each or one of the communication routes, and specifies a communication route used for downloading the content data 13. Thereby, the display control apparatus 1 can select a better communication route and download the content data 13. Further, when a good communication route cannot be secured, the display control device 1 may select a communication route again after a predetermined time has elapsed.

  Such a display control device 1 is suitable for displaying content on the display device 2 mounted on a moving body such as the bus 7. That is, since the bus 7 moves sequentially, the communication status changes sequentially. Therefore, by selecting a good communication route according to the position of the bus 7, it is possible to smoothly download content data using the selected communication route.

  Moreover, although the above-mentioned display control apparatus 1 demonstrated the case where it was mounted in the bus | bath 7, you may mount in other mobile bodies, such as a train.

(Other embodiments)
As described above, the embodiments of the present invention have been described. However, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

  For example, the display control apparatus described in the embodiment of the present invention may be configured on one piece of hardware as shown in FIG. 1, or may be configured on a plurality of pieces of hardware according to the functions and the number of processes. May be. Further, it may be realized on an existing processing system.

  It goes without saying that the present invention includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 1 Display control apparatus 2 Display apparatus 3 Speaker 4 Content provision server 5 Wireless communication network 5a Wireless communication access point 6 Mobile communication network 6a Mobile communication base station 7 Bus 8 Content display system 10 Storage apparatus 11 Location information data 12 Mode data 13 Content data DESCRIPTION OF SYMBOLS 14 Playlist data 15 Selected network data 20 Processing apparatus 21 Location information acquisition means 22 Mode acquisition means 23 Content display means 24 Content acquisition means 25 Network confirmation means 31 Wireless communication interface 32 Mobile communication interface

Claims (5)

A display control device that controls display of content data mounted on a mobile body and acquired from a content providing server on a display device mounted on the mobile body,
A wireless communication interface connected to the content providing server via a wireless communication network;
A mobile communication interface for connecting to the content providing server via a mobile communication network;
A test packet is transmitted to the content providing server via at least one of the wireless communication interface and the mobile communication interface, and based on a result of transmitting the test packet, the wireless communication interface and the mobile communication interface The content providing server displays the identifier of the content data to be displayed on the display device and the condition for displaying the content data via the determined communication interface . Requesting playlist data associated with another, receiving the playlist data from the content providing server, and out of the content data specified by the playlist data, the content data not stored in the display control device Identify and to, to the content providing server requests the content data specified from the content providing server, a content obtaining means for obtaining the identified content data,
Mode acquisition means for detecting an emergency and setting the emergency in the mode data;
When an emergency is set in the mode data, the display device includes content display means for displaying content data that meets the emergency conditions on the display device with reference to the playlist data.
A display control apparatus , wherein in the playlist data, volume setting information for outputting with loud sound is associated with the emergency content data . The content acquisition means includes
Request the data by specifying the data amount per packet to the content providing server,
The display control apparatus according to claim 1 , wherein a data amount when acquiring data via the wireless communication interface is larger than a data amount when acquiring data via the mobile communication interface. A display control device mounted on a mobile body is a display control method for controlling display of content data acquired from a content providing server on a display device mounted on the mobile body,
The display control device includes:
A wireless communication interface connected to the content providing server via a wireless communication network;
A mobile communication interface connected to the content providing server via a mobile communication network;
The display control device transmitting a test packet to the content providing server via at least one of the wireless communication interface and the mobile communication interface;
Determining whether the display control device communicates with the wireless communication interface or the mobile communication interface based on a result of transmitting the test packet;
The display control device associates an identifier of content data to be displayed on the display device with the content providing server via the determined communication interface and whether to distinguish normal or emergency as a condition for displaying the content data. Requesting the playlist data ,
The display control device acquiring the playlist data from the content providing server ;
The display control device specifies content data not stored in the display control device from the content data specified by the playlist data, and requests the specified content data from the content providing server. When,
The display control device acquiring the specified content data from the content providing server;
The display control device detecting an emergency and setting the emergency in the mode data;
When the display control device sets an emergency time in the mode data, the display control device includes the step of referring to the playlist data and causing the display device to display content data that meets the emergency condition,
In the play list data, a volume control information for outputting with loud sound is associated with the emergency content data .   A display control program for causing a computer to function as the means according to claim 1. Content display comprising: a content providing server that provides content data; and a display control device that is mounted on a mobile body and that controls display of content data acquired from the content providing server on a display device mounted on the mobile body A system,
The display control device includes:
A wireless communication interface connected to the content providing server via a wireless communication network;
A mobile communication interface for connecting to the content providing server via a mobile communication network;
A test packet is transmitted to the content providing server via at least one of the wireless communication interface and the mobile communication interface, and based on a result of transmitting the test packet, the wireless communication interface and the mobile communication interface The content providing server displays the identifier of the content data to be displayed on the display device and the condition for displaying the content data via the determined communication interface . Requesting playlist data associated with another, receiving the playlist data from the content providing server, and out of the content data specified by the playlist data, the content data not stored in the display control device Identify and to, to the content providing server requests the content data specified from the content providing server, a content obtaining means for obtaining the identified content data,
Mode acquisition means for detecting an emergency and setting the emergency in the mode data;
When an emergency is set in the mode data, the display device includes content display means for displaying content data that meets the emergency conditions on the display device with reference to the playlist data .
The content providing server includes:
Upon receipt of the test packet, the display control device transmits a message indicating that the test packet has been received, and includes processing means for transmitting the data in response to the data request ,
Wherein the playlist data, the content display system, characterized in that the emergency of the content data, the Ru associated setting information of the volume for output in a large sound.

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