JP2014135681A - Stream processing device, remote control system, communication control method, remote control method and communication control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stream processing device achieving stable communication.SOLUTION: An STB (Set To Box) 101 includes: a stream processing part 26 for processing a stream including program information; a control part 22 for controlling the STB 101 according to information received from a terminal 202 through a relay server 151; and a connection processing part 24 for performing establishment processing and disconnection processing of a communication connection between the relay server 151 and the self-STB 101. When changing the relay server 151 of a communication connection destination, the connection processing part 24 performs processing to establish a communication connection between the change destination relay server 151 and the self-STB 101 while maintaining the established communication connection between the change origin relay server 151 and the self-STB 101. After the communication connection is established between the change destination relay server 151 and the self-STB 101, the connection processing part 24 performs processing to disconnect the communication connection between the change origin relay server 151 and the self-STB 101.

Description

  The present invention relates to a stream processing device, a remote operation system, a communication control method, a remote operation method, and a communication control program, and in particular, a stream processing device, a remote operation system, a communication control method, a remote operation method, and a communication that are remotely operated by a terminal. It relates to the control program.

  "At Dime", [online], [October 24, 2012 search], Internet <URL: http://dime.jp/manual/264/> (Non-Patent Document 1) includes remote control of TV An application for using a smart phone as a TV remote control that enables the above is disclosed. For example, a home TV is remotely controlled by touching or flicking a smartphone screen.

  The remote operation method described in Non-Patent Document 1 is not a mechanism for transmitting a signal using infrared rays toward a television like an ordinary television remote control. When the smart phone is compatible with the DLNA (Digital Living Network Alliance) standard that can be connected to a home LAN (Local Area Network) using, for example, Wi-Fi (registered trademark), the smart phone The operation signal can be transmitted to the television via Wi-Fi.

  In this case, the TV can be operated with the normal smart phone operation style without directing the infrared transmission portion of the TV remote control to the TV as in an ordinary TV remote control. That is, the smart phone on which the application is installed may not have an infrared communication function.

"At Dime", [online], [October 24, 2012 search], Internet <URL: http://dime.jp/manual/264/>

  In the technique described in Non-Patent Document 1, when a terminal such as a smart phone moves outside an area formed by a Wi-Fi access point connected to a home LAN, the television cannot be operated by the terminal. For example, if the recording of a program and the reservation of a program can be set on a television by operating the terminal while away from home, the convenience for the user is enhanced. For this purpose, it is conceivable to connect a stream processing apparatus such as a television and an STB (Set Top Box) and a terminal via an external server.

  When the stream processing apparatus is connected to the external server in this way, for example, the external server may be switched as necessary for load distribution. However, if the connection between the stream processing device and the external server is interrupted at the time of switching, stable communication may not be possible.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a stream processing apparatus capable of stable communication, a remote operation system thereof, a communication control method, a remote operation method, and a communication control program. It is to be.

  (1) In order to solve the above-described problem, a stream processing apparatus according to an aspect of the present invention is a stream processing apparatus for processing a stream including information of one or more programs, the terminal and the stream processing According to information received from the terminal via a relay server for relaying information transmitted / received between the devices, a remote operation processing unit for controlling the stream processing device of the device, and the stream of the relay server and the device itself A connection processing unit for performing communication connection establishment processing and disconnection processing with the processing device, and when the connection processing unit changes the communication connection destination relay server, the connection processing unit While maintaining the communication connection established with the above-mentioned stream processing apparatus, the change-destination relay server that is the change-destination relay server and the The communication processing unit establishes a communication connection with the stream processing device, and the connection processing unit establishes a communication connection between the change-destination relay server and its own stream processing device, and then changes the relay server that is the change source. And a process of disconnecting the communication connection between itself and the above-described stream processing apparatus.

  In this way, after establishing the communication connection between the stream processing device and the change-destination relay server, the stream processing device is configured to disconnect the communication connection between the stream processing device and the change-source relay server. The communication connection destination can be changed while maintaining the communication connection with at least one of the server and the change destination relay server.

  (2) Preferably, the stream processing device further includes an authentication server for authenticating the stream processing device and the terminal, and an authentication processing unit for performing authentication processing, and the authentication processing unit includes a communication connection destination. When the relay server is changed, an authentication request is transmitted to the authentication server, and the authentication processing unit transmits the address of the change-destination relay server, its own stream processing device, and the information as information for the authentication request. Communication information used when transmitting / receiving information between terminals via the change destination relay server is received from the authentication server, and the connection processing unit uses the address and the communication information to change the change destination. Processing for establishing a communication connection between the relay server and its own stream processing apparatus is performed.

  In this way, after verifying the validity of the stream processing device, the stream processing device that is not valid can be connected to the relay server by the configuration in which the stream processing device can change the relay server of the communication connection destination. Can be avoided.

  As a result, the stream processing apparatus having legitimacy can avoid receiving unauthorized access by the stream processing apparatus having no legitimacy via the relay server. The security level can be improved.

  (3) More preferably, the communication information includes information used by the remote operation processing unit when the remote operation processing unit performs encrypted communication with the terminal via the change destination relay server.

  With this configuration, highly confidential communication can be performed between the stream processing device and the terminal via the relay server.

  (4) More preferably, the communication information includes information used by the change destination relay server when the change destination relay server relays information transmitted and received between the terminal and the stream processing device.

  With such a configuration, communication according to the protocol used in the relay server to be changed can be performed between the stream processing apparatus and the terminal.

  (5) Preferably, the remote operation processing unit transmits information used by the change-destination relay server via the relay server when the relay server relays information transmitted and received between the terminal and the stream processing device. If it is included in the information received from the terminal, it controls its own stream processing device according to the information.

  With such a configuration, the stream processing apparatus can operate by accepting a remote operation of the terminal after confirming that the information is received from the terminal via a specific relay server.

  (6) Preferably, the connection processing unit changes the relay server of the communication connection destination every predetermined time.

  As described above, the configuration in which the relay server of the communication connection destination is changed in the stream processing device every predetermined time improves the security level of communication between the stream processing device and the relay server, and is appropriate according to the situation of the communication network. A relay server can be selected.

  (7) Preferably, the terminal is a portable information terminal.

  With such a configuration, it is possible to improve the convenience of a user who owns a portable information terminal that moves not only in the house but also in a wide area outside the house.

  (8) In order to solve the above problem, a remote control system according to an aspect of the present invention provides a stream processing device for processing a stream including information of one or more programs, a terminal, and the stream processing device. A remote operation system including a plurality of relay servers for relaying information transmitted and received in the network, wherein the stream processing device performs an operation according to the information relayed by the relay server, and the stream processing device The change destination relay server that is the change destination relay server while maintaining the communication connection established between the change source relay server and itself when changing the communication connection destination relay server The stream processing apparatus establishes a communication connection between the change destination relay server and itself. Performs a process to disconnect the communication connection with the change source of the relay server and self.

  In this way, after establishing the communication connection between the stream processing device and the change-destination relay server, the stream processing device is configured to disconnect the communication connection between the stream processing device and the change-source relay server. The communication connection destination can be changed while maintaining the communication connection with at least one of the server and the change destination relay server.

  (9) Preferably, the remote operation system further includes an authentication server for authenticating the stream processing device and the terminal, and the stream processing device changes the relay server as a communication connection destination. An authentication request is transmitted to the authentication server, and when the authentication server receives the authentication request from the stream processing device, the authentication processing is performed on the stream processing device, and the authentication server has succeeded in the device authentication processing. In this case, the address of the change destination relay server and the communication information used when transmitting / receiving information between the stream processing device and the terminal via the change destination relay server are transmitted to the stream processing device, The stream processing device uses the address and the communication information received from the authentication server. It performs processing for establishing a communication connection with the change destination relay server and self.

  As described above, the configuration in which the authenticated stream processing apparatus is connected to the change-destination relay server can prevent the stream processing apparatus having no validity from establishing the communication connection with the relay server.

  As a result, in the remote operation system, for example, unauthorized access by a stream processing device having no legitimacy can be eliminated, so that the security level in the remote operation system can be improved.

  (10) More preferably, the remote operation system further stores a table in which device identification information for identifying the stream processing device and terminal identification information for identifying the terminal are associated with each other. The stream processing device transmits its device identification information to the authentication server when the relay server of the communication connection destination is changed, and the authentication server receives the authentication from the stream processing device. When the request and the device identification information are received, device authentication processing is performed on the stream processing device, and the authentication server transmits the address and the communication information to the stream processing device when the device authentication processing is successful. And holding the communication information and the terminal identification information in correspondence with each other on the basis of the table. When the terminal identification information is received from the terminal, the terminal authentication process is performed on the terminal. When the terminal authentication process is successful, the authentication server includes the address of the change destination relay server and the terminal identification information. The corresponding communication information is transmitted to the terminal.

  With such a configuration, information exchanged between the change destination relay server and the stream processing apparatus and information exchanged between the change destination relay server and the terminal can be associated with each other at the change destination relay server.

  Thereby, information can be transmitted and received between the stream processing device and the terminal via the relay server.

  In addition, the stream processing apparatus can operate by accepting remote operation of the terminal after confirming that the information is received from the terminal via a specific relay server.

  (11) Preferably, the remote operation system further measures a processing load on each of the relay servers, or sets the change destination relay server to which the stream processing apparatus should establish a communication connection as the processing load. Accordingly, a load management server for selecting from the relay servers is provided.

  With such a configuration, the processing load of each relay server in the remote operation system can be leveled.

  (12) In order to solve the above-described problem, a communication control method according to an aspect of the present invention is a communication control method in a stream processing apparatus for processing a stream including information of one or more programs. And a step of establishing a communication connection with a relay server for relaying information transmitted and received between the stream processing devices, and a step of performing an operation in accordance with information received from the terminal via the relay server When the relay server at the communication connection destination is changed, the communication connection established with the relay server at the change source is maintained and the relay server at the change destination relay server is maintained. After establishing the communication connection and establishing the communication connection with the change-destination relay server, disconnect the communication connection with the change-source relay server. And a step of performing processing for.

  In this way, after establishing the communication connection between the stream processing device and the change-destination relay server, the stream processing device is configured to disconnect the communication connection between the stream processing device and the change-source relay server. The communication connection destination can be changed while maintaining the communication connection with at least one of the server and the change destination relay server.

  (13) In order to solve the above-described problem, a remote control method according to an aspect of the present invention provides a stream processing device for processing a stream including information on one or more programs, a terminal, and the stream processing device. A remote operation method in a remote operation system comprising a plurality of relay servers for relaying information transmitted and received in the relay server, wherein the relay server relays information transmitted from a terminal to the stream processing device; A step in which the stream processing device performs an operation according to the information relayed by the relay server; and when the stream processing device changes the relay server to be a communication connection destination, While maintaining the communication connection established with itself, the change-destination relay server that is the change-destination relay server A step of performing a process of establishing a communication connection with itself, and after the communication connection between the change destination relay server and itself is established, the stream processing apparatus establishes a communication connection between the change source relay server and itself. And a step of performing a cutting process.

  In this way, after establishing the communication connection between the stream processing device and the change-destination relay server, the stream processing device is configured to disconnect the communication connection between the stream processing device and the change-source relay server. The communication connection destination can be changed while maintaining the communication connection with at least one of the server and the change destination relay server.

  (14) In order to solve the above problem, a communication control program according to an aspect of the present invention is a communication control program used in a stream processing apparatus for processing a stream including information of one or more programs. Performing a process of establishing a communication connection with a relay server for relaying information transmitted and received between the terminal and the stream processing device to the computer, and information received from the terminal via the relay server. When the communication connection destination relay server is changed and the communication connection destination is changed, the communication connection established with the change source relay server is maintained and the change destination relay server is changed. After performing the process of establishing a communication connection with the destination relay server, and after establishing the communication connection with the change destination relay server, Is a program for executing and performing a process to disconnect the communication connection with the Saramoto the relay server.

  In this way, after establishing the communication connection between the stream processing device and the change-destination relay server, the stream processing device is configured to disconnect the communication connection between the stream processing device and the change-source relay server. The communication connection destination can be changed while maintaining the communication connection with at least one of the server and the change destination relay server.

  According to the present invention, stable communication can be performed.

It is a figure which shows the structure of the remote control system which concerns on embodiment of this invention. It is a figure which shows the structure of STB which concerns on embodiment of this invention. It is a figure which shows an example of the table which the memory | storage part which concerns on embodiment of this invention memorize | stores. It is a sequence diagram which shows an example of the operation | movement at the time of performing the update process of WS connection in the remote control system which concerns on embodiment of this invention. It is a sequence diagram which shows an example of the operation | movement at the time of performing communication according to WS protocol between the terminal and STB which concern on embodiment of this invention. It is the flowchart which defined an example of the operation | movement procedure when STB which concerns on embodiment of this invention changes the relay server of communication connection.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Overview of remote control system]
FIG. 1 is a diagram showing a configuration of a remote control system according to an embodiment of the present invention.

  Referring to FIG. 1, a remote operation system 10 includes STBs (stream processing devices) 101A, 101B, 101C, and 101D, a load management server 111, display devices 121A, 121B, 121C, and 121D, and relay servers 151A and 151B. , 151C, an authentication server 161, a distribution server 171, a wireless base station device 201, terminals 202A and 202B, and a gateway 203.

  Hereinafter, each of the STBs 101A, 101B, 101C, and 101D may be referred to as an STB 101. Each of display devices 121A, 121B, 121C, and 121D may be referred to as display device 121. Each of the relay servers 151A, 151B, and 151C may be referred to as a relay server 151. Each of terminals 202A and 202B may be referred to as terminal 202.

  In FIG. 1, four STBs 101 are representatively shown, but a larger or smaller number of STBs 101 may be provided. In addition, although four display devices 121 are representatively shown, a larger or smaller number of display devices 121 may be provided. Although three relay servers 151 are representatively shown, a larger or smaller number of relay servers 151 may be provided. Further, although two terminals 202 are representatively shown, a larger number or a smaller number of terminals 202 may be provided.

  The gateway 203, the radio base station apparatus 201, the authentication server 161, the distribution server 171, and the load management server 111 are not necessarily limited to one, and two or more may be provided.

  The STB 101, the load management server 111, the relay server 151, the authentication server 161, the distribution server 171 and the gateway 203 are connected to each other via the network 11, for example. The network 11 is an IP network, for example.

  Upon receiving a request for program information from the STB 101, the distribution server 171 distributes a stream including the program information to the STB 101 via the network 11 by using, for example, IP.

  The STB 101 receives a stream including information on one or a plurality of programs from the distribution server 171 via the network 11, and acquires the program information by processing the received streams. Then, the STB 101 displays the acquired program information on the display device 121, for example. The remote operation system 10 may be configured to include a television including the display device 121 instead of the STB 101.

  The authentication server 161 includes a storage unit for storing a table in which device identification information for identifying the STB 101 and terminal identification information for identifying the terminal 202 are associated with each other, for example. The table will be described later.

  For example, when the STB 101 transitions from a power-off state to a power-on state, the authentication server 161 performs an authentication process on the STB 101. Then, when the authentication process is successful, the authentication server 161 transmits the address of the relay server 151 to which the STB 101 should be connected to the STB 101.

  The STB 101 establishes a communication connection with the relay server 151 based on the address received from the authentication server. Details of the authentication process in the authentication server 161 will be described later.

  In addition, a plurality of STBs 101 may establish communication connection with respect to one relay server 151. Specifically, for example, the STB 101B and the STB 101C can establish a communication connection with the relay server 151B.

  When establishing a communication connection with the STB 101, the terminal 202 requests an authentication process from the authentication server 161. When the authentication process for the terminal 202 is successful, the authentication server 161 transmits the address of the relay server 151 to which the terminal 202 is connected to the terminal 202.

  The terminal 202 establishes a communication connection with the relay server 151 based on the address received from the authentication server. In addition, a plurality of terminals 202 may establish communication connection with respect to one relay server 151.

  For example, communication according to the WS (WebSocket) protocol (RFC6455 compliant) is performed between the STB 101 and the relay server 151. Further, for example, communication according to the WS protocol is performed between the terminal 202 and the relay server 151. Specifically, the terminal 202 is a wireless terminal device such as a smart phone and a portable information terminal such as a notebook PC.

  The relay server 151 relays information transmitted and received between the terminal 202 and the STB 101. More specifically, the STB 101 and the terminal 202 exchange WS frames via the relay server 151. WS frames include control frames and non-control frames. In the payload of the non-control frame, a WS message transmitted / received by the application in the STB 101 and the terminal 202 is stored.

  Specifically, for example, the STB 101A is in a state of establishing a communication connection with the relay server 151A via the network 11. Further, the terminal 202A is in a state of establishing a communication connection with the relay server 151A via the radio base station device 201, the gateway 203, and the network 11.

  The radio base station apparatus 201 transmits information included in the radio signal received from the terminal 202A to the gateway 203. Also, the radio base station apparatus 201 transmits a radio signal including information received from the gateway 203 to the terminal 202A.

  The gateway 203 transmits and receives information between the relay server 151A and the radio base station apparatus 201 by connecting the network 11 and a network including the radio base station apparatus 201.

  That is, the STB 101 and the terminal 202 can perform bidirectional communication by establishing a communication connection via the relay server 151. At this time, the STB 101 and the terminal 202 transmit and receive information in a push type without polling the relay server 151.

  Note that once the communication connection with the relay server 151 is established once, the STB 101 and the terminal 202 can maintain the communication connection without regularly transmitting information to the relay server 151.

  The STB 101 receives a remote operation from the terminal 202 based on information relayed by the relay server 151. Specifically, the STB 101A performs an operation according to information received from the terminal 202A via the relay server 151.

  For example, in a situation where the STB 101A displays information on a program distributed from the distribution server 171 on the display device 121A, a situation in which a viewer who views the program information operates the terminal 202A to control the STB 101A. Suppose.

  When the viewer gives a control command for controlling the STB 101A to the terminal 202A, the terminal 202A transmits information indicating the control command to the STB 101A via the relay server 151A.

  The STB 101A performs an operation according to information received from the terminal 202A via the relay server 151, that is, a control command.

  Accordingly, the viewer operates the terminal 202A while viewing the display device 121A, thereby turning on the power, turning off the power, transmitting program information, selecting a program, playing a program, and playing a program to the STB 101A. Recording, program reservation, trick playback, stop playback, and the like.

  For example, the STB 101 can transmit program information to the terminal 202 via the relay server 151 in response to a request from the terminal 202. Thereby, the viewer can control the STB 101 by operating the seek bar displayed together with the thumbnail on the terminal 202 such as a smart phone.

  Further, the viewer can control the STB 101 by operating a web page on which a program is displayed on a terminal 202 such as a notebook PC.

[Problems in remote control systems]
The STB 101 performs, for example, cryptographic communication between itself and the terminal 202. In this case, it is preferable to refresh the communication connection between the STB 101 and the relay server 151 in order to maintain the security of the communication.

  In addition, the number of STBs 101 and terminals 202 that are communicatively connected to the relay server 151 changes with time. Also, the amount of information relayed by the relay server 151 changes with time. That is, the processing load of information differs for each relay server 151.

  For this reason, for example, when the processing load on the relay server 151B increases, the processing speed on the relay server 151B decreases, and the user's feeling of using the STBs 101B and 101C connected to the relay server 151B is lost.

  Therefore, it is preferable to perform a change process of the STB 101 and the terminal 202 that are connected to the relay server 151 so that the processing load on each relay server 151 is leveled.

  However, since the STB 101 needs to wait for control information transmitted from the terminal 202 via the relay server 151, it is preferable to stably maintain the communication connection once the communication connection with the relay server 151 is established. .

  Therefore, in remote operation system 10 and STB 101 according to the embodiment of the present invention, the communication connection between STB 101 and terminal 202 is prevented from being disconnected by the following configuration and operation.

[Configuration of STB]
FIG. 2 is a diagram showing the configuration of the STB according to the embodiment of the present invention.

  Referring to FIG. 2, STB (stream processing device) 101 includes a communication unit 21, a control unit (remote operation processing unit) 22, an instruction receiving unit 23, a connection processing unit 24, an authentication processing unit 25, A stream processing unit 26 and a timer 27 are provided.

  The communication unit 21 transmits and receives packets to and from the relay server 151, the authentication server 161, the terminal 202, and the distribution server 171 via the network 11 such as the Internet.

  The instruction receiving unit 23 receives instructions from the user such as power on / off of the STB 101, program selection, program reproduction, program recording, program reservation, trick reproduction and reproduction stop. Then, the instruction receiving unit 23 outputs a control command corresponding to the instruction received from the user to the control unit 22.

  The control unit 22 controls transmission of information transmitted and received by the connection processing unit 24, the authentication processing unit 25, and the stream processing unit 26 via the communication unit 21. Further, upon receiving a control command from the instruction receiving unit 23, the control unit 22 controls the operation of the STB 101 based on the received control command.

  Specifically, for example, when the user turns on the power of the STB 101 by the user, the control unit 22 initializes a communication connection between the STB 101 and the relay server 151, specifically, a WS connection. Is output to the authentication processing unit 25 and the connection processing unit 24.

  Further, when receiving a WS connection establishment notification indicating that a WS connection has been established from the connection processing unit 24, the control unit 22 activates a timer 27 for measuring a predetermined time.

  When the operation of the timer 27 expires, the control unit 22 outputs, to the authentication processing unit 25 and the connection processing unit 24, a WS connection update command for changing the relay server 151 of the communication connection destination of its own STB 101 in order to refresh the WS connection. To do.

[Processing of Authentication Processing Unit for WS Connection Update Command and Initialization Command]
When receiving the WS connection update command or the initialization command from the control unit 22, the authentication processing unit 25 performs authentication processing with the authentication server 161. Specifically, the authentication processing unit 25 performs subscriber authentication processing with the authentication server 161 by transmitting an authentication request including device identification information for identifying its own STB 101 to the authentication server 161.

  The authentication processing unit 25 uses the address of the change-destination relay server 151, which is a relay server 151 to newly establish a communication connection, and the change-destination relay server 151 between its own STB 101 and terminal 202 as information for the authentication request. The communication information used when transmitting / receiving information via the authentication server 161 is received.

  Specifically, the address is the IP address and port number of the relay server 151.

  The communication information includes information used by the control unit 22 when the control unit 22 performs encrypted communication with the terminal 202 via the change destination relay server 151.

  The information is an encryption key for encrypting a WS message transmitted / received between the STB 101 and the terminal 202, for example.

  The communication information includes information used by the change-destination relay server 151 when the change-destination relay server 151 relays information transmitted / received between the terminal 202 and the STB 101, for example, a relay ID.

  Upon receiving the address and communication information from the authentication server 161, the authentication processing unit 25 determines that the authentication processing for its own STB 101 has been successful, and outputs the received address and communication information to the connection processing unit 24.

[Processing of Connection Processing Unit for WS Connection Update Instruction]
The connection processing unit 24 performs communication connection establishment processing and disconnection processing between the relay server 151 and its own STB 101. More specifically, after receiving the WS connection update command from the control unit 22, the connection processing unit 24 performs the following processing when receiving the address and communication information of the relay server 151 to be changed from the authentication processing unit 25. .

  That is, the connection processing unit 24 establishes a communication connection between the change-destination relay server 151 and its own STB 101 while maintaining the communication connection established between the change-source relay server 151 and its own STB 101. Process. Specifically, the connection processing unit 24 performs the following WS open processing based on the address of the change destination relay server 151 and the communication information.

  That is, for example, the connection processing unit 24 sets the IP address and port number of the relay server 151 to be changed as the transmission destination of the connection request including the relay ID of the relay server 151 to be changed, and changes the connection request. It transmits to the previous relay server 151.

  When the connection processing unit 24 receives connection permission as a response to the connection request from the relay server 151 of the change destination, the connection processing unit 24 determines that the communication connection between the relay server 151 of the change destination and its own STB 101 has been established. At this time, the relay server 151 of the change destination allocates resources for communicating with the STB 101 according to the WS protocol.

  Then, the connection processing unit 24 outputs a WS connection establishment notification to the control unit 22. Thereby, the WS open process is completed.

  The connection processing unit 24 performs processing for disconnecting the communication connection between the change-source relay server 151 and the own STB 101 after the communication connection between the change-destination relay server 151 and the own STB 101 is established.

  Specifically, the connection processing unit 24 transmits, for example, a connection disconnection request to the relay server 151 of the change source. When the connection processing unit 24 receives a disconnection response from the change source relay server 151, the connection processing unit 24 determines that the communication connection between the change source relay server 151 and its own STB 101 has been cut. At this time, the change source relay server 151 releases resources for communicating with the STB 101 in accordance with the WS protocol.

[Processing of connection processing unit for initialization instruction]
On the other hand, when the connection processing unit 24 receives the initialization command from the control unit 22 and receives the address of the change destination relay server 151 and the communication information from the authentication processing unit 25, the connection processing unit 24 receives the address of the change destination relay server 151 and WS open processing is performed based on the communication information.

  When the connection processing unit 24 determines that the communication connection between the relay server 151 to be changed and its own STB 101 has been established, the connection processing unit 24 outputs a WS connection establishment notification to the control unit 22.

  When the control unit 22 receives an instruction from the instruction receiving unit 23 such as program selection, program reproduction, program recording, program reservation, trick reproduction, and stop of reproduction, the stream control according to the received instruction is performed. The instruction is output to the stream processing unit 26.

  In accordance with the stream control command received from the control unit 22, the stream processing unit 26 receives, for example, a stream including information on one or more programs from the distribution server 171 via the network 11, and processes the received stream to process the program. Get information. Then, the stream processing unit 26 displays the acquired program information on the display device 121, for example.

  In addition, when the relay ID is included in the information received from the terminal 202 via the relay server 151, the control unit 22 controls the STB 101 according to the information.

  Specifically, the control unit 22 sends information including instructions regarding the program such as transmission of program information, program selection, program playback, program recording, program reservation, trick playback, and stop of playback from the terminal 202. When received, a stream control command corresponding to the received information is output to the stream processing unit 26.

  When the control unit 22 receives information including an instruction regarding the operation of the STB 101 such as power-on and power-off of the STB 101 from the terminal 202, the control unit 22 controls the STB 101 according to the received information. Thereby, the control unit 22 enables the terminal 202 to remotely operate the STB 101.

[Updating WS connection in remote operation system]
Referring to FIG. 1 again, the load management server 111 measures the processing load on each relay server 151. The load management server 111 measures the processing load every predetermined time, for example.

  When receiving the load information request from the authentication server 161, the load management server 111 selects the relay server 151 to which the STB 101 should establish a communication connection from the relay servers 151 according to the measured processing load.

  Specifically, for example, when the load management server 111 receives a request for load information from the authentication server 161, the relay server 151 to which the STB 101 should establish a communication connection so that the processing load in each relay server 151 is leveled. Select.

  Then, the load management server 111 transmits, for example, the identifier of the selected relay server 151 to the authentication server 161.

  Further, when receiving the load information request from the authentication server 161, the load management server 111 may transmit the measured processing load of each relay server 151 to the authentication server 161, for example. In this case, the authentication server 161 selects the relay server 151 to which the STB 101 should establish a communication connection based on the processing load of each relay server 151.

  FIG. 3 is a diagram showing an example of a table stored in the storage unit according to the embodiment of the present invention.

  Referring to FIG. 3, authentication server 161 associates, for example, STB terminal information that is device identification information for identifying STB 101 with terminal login ID that is terminal identification information for identifying terminal 202. The table 45 is stored.

  The authentication server 161 authenticates the STB 101 and the terminal 202 based on the table 45.

[Operation of remote control system]
The STB 101, the authentication server 161, and the load management server 111 in the remote operation system according to the embodiment of the present invention read and execute a program including the following sequences and flowchart steps from a memory (not shown). This program can be installed externally. The installed program is distributed in a state stored in a recording medium, for example.

  FIG. 4 is a sequence diagram showing an example of an operation when performing a WS connection update process in the remote control system according to the embodiment of the present invention.

  Referring to FIG. 1 and FIG. 4, a situation is assumed in which STB 101A changes the WS connection with relay server 151A to the WS connection with relay server 151B.

  First, the STB 101A has established a communication connection with the relay server 151A (step S202).

  Next, for example, since a predetermined time has elapsed since the last update process of the WS connection, the STB 101A starts a process of changing the communication connection destination (step S204).

  Next, the STB 101A transmits an authentication request including its own device identification information such as “STB-ID-A” to the authentication server 161 (step S206).

  Next, when the authentication server 161 receives an authentication request including “STB-ID-A” that is device identification information from the STB 101A, the authentication server 161 performs device authentication processing on the STB 101A based on the device identification information (step S208).

  Next, when the device authentication process is successful, the authentication server 161 transmits a load information request to the load management server 111 in order to select the relay server 151 that is the change destination of the STB 101A (step S210).

  Next, when the load management server 111 receives a load information request from the authentication server 161, the STB 101 selects a relay server 151 to establish a communication connection. Then, the load management server 111 includes the identifier of the selected relay server 151, for example, the relay server 151B, in the load information response and transmits it to the authentication server 161 (step S212).

  Next, when receiving the load information response from the load management server 111, the authentication server 161 selects the relay server 151B indicated by the identifier included in the load information response as the change-destination relay server 151B.

  Next, the authentication server 161 sets a relay ID, for example, a relay ID 55 and an encryption key, for the relay server 151B to be changed (step S214). The relay ID and encryption key may be arbitrary values.

  Next, the authentication server 161 refers to the table 45 to obtain the terminal login ID “UE-ID-A”, which is the terminal identification information corresponding to the device identification information “STB-ID-A”, for relaying. Communication information including ID 55 and the encryption key is stored in association with “UE-ID-A” (step S216).

  Next, the authentication server 161 transmits an authentication response including the address of the relay server 151B to be changed and the communication information to the STB 101A (step S218).

  Next, when the STB 101A receives the authentication response from the authentication server 161, the STB 101A acquires the address and communication information of the relay server 151B to be changed from the authentication response, and includes the relay ID 55 acquired from the communication information. The request destination is transmitted as the address (step S220).

  Next, when receiving the connection request from the STB 101A, the relay server 151B holds the relay ID 55 included in the connection request in association with the address of the STB 101A, and transmits a connection permission to the STB 101A (step S222).

  Next, when receiving the connection permission from the relay server 151B, the STB 101A determines that the communication connection between the relay server 151B and itself is established (step S224).

  Next, the STB 101A transmits a connection disconnection request for disconnecting the communication connection with the relay server 151A to the relay server 151A (step S226).

  Next, when receiving a connection disconnection request from the STB 101A, the relay server 151A releases the resources used for the communication connection of the STB 101A and transmits a connection disconnection response to the STB 101A (step S228).

  As described above, the communication connection between the STB 101A and the relay server 151A is changed to a disconnected state (step S230).

[Communication according to WS protocol between terminal and STB]
FIG. 5 is a sequence diagram showing an example of an operation when communication according to the WS protocol is performed between the terminal and the STB according to the embodiment of the present invention.

  Referring to FIGS. 1 and 5, STB 101A has established a communication connection with relay server 151B (step S302). Note that the STB 101A and the relay server 151B hold the relay ID 55.

  Next, the terminal 202A transmits an authentication request including a terminal login ID, for example, “UE-ID-A”, which is its own terminal identification information, to the authentication server 161 (step S304).

  Next, when receiving an authentication request including “UE-ID-A” from the terminal 202A, the authentication server 161 performs terminal authentication processing on the terminal 202A based on the terminal identification information (step S306).

  Next, when the terminal authentication process is successful, the authentication server 161 transmits an authentication response including the address of the relay server 151B and communication information to the terminal 202A (step S308). Note that the communication information is information held in association with “UE-ID-A” when the authentication server 161 performs device authentication processing on the STB 101A, and includes the relay ID 55 and the encryption key.

  Next, when the terminal 202A receives the authentication response from the authentication server 161, the terminal 202A acquires the address of the relay server 151B and communication information from the authentication response, and sets the transmission destination of the connection request including the acquired relay ID 55 as the address. (Step S310).

  Next, when receiving the connection request from the terminal 202A, the relay server 151B holds the relay ID 55 included in the connection request in association with the address of the terminal 202A, and transmits a connection permission to the terminal 202A (step S312). .

  Next, when receiving the connection permission from the relay server 151B, the terminal 202A determines that the communication connection between the relay server 151B and itself has been established (step S314).

  Next, terminal 202A transmits operation information including information for controlling STB 101A and relay ID 55 to relay server 151B (step S316). At this time, the terminal 202A encrypts the operation information using, for example, an encryption key included in the communication information.

  Next, when receiving the operation information from the terminal 202A, the relay server 151B relays the operation information based on the relay ID 55 included in the operation information. More specifically, the relay server 151B recognizes that the operation information transmission destination is the address of the STB 101A corresponding to the relay ID 55, and transmits the received operation information to the STB 101A (step S318).

  Next, when receiving the operation information from the relay server 151B, the STB 101A decrypts the operation information with the encryption key and recognizes that the relay ID 55 is included in the operation information. Then, the STB 101A performs an operation according to the decrypted operation information (step S320).

  The operations include, for example, power on, power off, transmission of program information, program selection, program playback, program recording, program reservation, trick playback, and stop of playback.

  Next, the STB 101A transmits an operation response including information on the STB 101A or program information and the relay ID 55 to the relay server 151B (step S322). At this time, the STB 101A encrypts the operation response using, for example, an encryption key.

  Next, when receiving an operation response from the STB 101A, the relay server 151B relays the operation response based on the relay ID 55 included in the operation response. More specifically, the relay server 151B recognizes that the destination of the operation response is the address of the terminal 202A corresponding to the relay ID 55, and transmits the received operation response to the terminal 202A (step S324).

  Next, when the terminal 202A receives the operation response from the relay server 151B, the terminal 202A decrypts the operation response using the encryption key. When the relay response 55 is included in the operation response, the terminal 202A includes the STB 101A included in the decrypted operation response. The state or program information is displayed on, for example, a display owned by the user.

[Basic operation of STB]
FIG. 6 is a flowchart that defines an example of an operation procedure when the STB according to the embodiment of the present invention changes the relay server of the communication connection destination.

  Referring to FIG. 6, first, STB 101 is in an initial state in which, for example, the main power supply is turned on (step S102).

  Next, the STB 101 transmits an authentication request to the authentication server 161. When the device authentication process is successful in the authentication server 161, for example, the address of the relay server 151A and communication information are received from the authentication server 161 (step S104).

  Next, the STB 101 establishes a communication connection with the relay server 151A based on the address and communication information received from the authentication server 161 (step S106).

  Next, the STB 101 activates a timer (step S108).

  Next, when the timer operation is completed (YES in step S112), the STB 101 sends an authentication request to the authentication server 161 to change the communication connection destination relay server 151 from the relay server 151A to another relay server 151. Send. When the device authentication process is successful in the authentication server 161, the STB 101 acquires, for example, the address of the relay server 151B and communication information from the authentication server 161 (step S114).

  Next, the STB 101 establishes a communication connection with the change-destination relay server 151B based on the address and communication information received from the authentication server 161 (step S116).

  Next, the STB 101 disconnects the communication connection with the change-source relay server 151A (step S118), and starts the timer again (step S108).

  In step S116 and step S118, the STB 101 distinguishes the change-destination relay server 151B and the change-source relay server 151A based on the IP address and port number of the relay server 151.

  Therefore, the relay server 151B to be changed and the relay server 151A to be changed may be housed in the same casing as one server. In this case, the relay servers 151A and 151B have the same IP address but different port numbers. That is, in STB 101, a relay server 151 having at least one of an IP address and a port number that can be handled as another relay server 151.

  By the way, since the STB 101 needs to wait for control information transmitted from the terminal 202 via the relay server 151, it is preferable that the communication connection is stably maintained once the communication connection with the relay server 151 is established. .

  In contrast, in the stream processing device according to the embodiment of the present invention, control unit 22 receives information from terminal 202 via relay server 151 for relaying information transmitted and received between terminal 202 and STB 101. And controls its own STB 101. The connection processing unit 24 performs communication connection establishment processing and disconnection processing between the relay server 151 and its own STB 101. When changing the communication connection destination relay server 151, the connection processing unit 24 maintains the communication connection established between the change source relay server 151 and its own STB 101, and the change destination relay server 151. And a process of establishing a communication connection between the mobile station and its own STB 101. Then, after the communication connection between the change-destination relay server 151 and its own STB 101 is established, the connection processing unit 24 performs a process of disconnecting the communication connection between the change-source relay server 151 and its own STB 101.

  As described above, after establishing communication connection between the STB 101 and the change-destination relay server 151, the STB 101 is configured to disconnect the communication connection between the STB 101 and the change-source relay server 151. The communication connection destination can be changed while maintaining the state where the communication connection with at least one of the previous relay servers 151 is established.

  Further, in the stream processing apparatus according to the embodiment of the present invention, authentication processing unit 25 performs authentication processing with authentication server 161 for authenticating STB 101 and terminal 202. When changing the communication connection destination relay server 151, the authentication processing unit 25 transmits an authentication request to the authentication server 161. As information for the authentication request, the address of the change destination relay server 151, its own STB 101, and the terminal Information for communication used when information is transmitted / received between the change destination relay servers 151 between the authentication servers 161 is received from the authentication server 161. Then, the connection processing unit 24 performs processing for establishing a communication connection between the relay server 151 to be changed and its own STB 101 using the address and the communication information.

  In this way, after verifying the validity of the STB 101, the configuration in which the relay server 151 of the communication connection destination by the STB 101 can be changed to prevent the STB 101 having no validity from being connected to the relay server 151. can do.

  Thereby, the legitimate STB 101 can avoid receiving unauthorized access by the STB 101 having no legitimacy, for example, via the relay server 151, so that the security level of the legitimate STB 101 is improved. be able to.

  In the stream processing apparatus according to the embodiment of the present invention, the communication information is information used by the control unit 22 when the control unit 22 performs cryptographic communication with the terminal 202 via the change-destination relay server 151. Including.

  With such a configuration, highly confidential communication can be performed between the STB 101 and the terminal 202 via the relay server 151.

  Further, in the stream processing apparatus according to the embodiment of the present invention, the communication information is received by the change destination relay server 151 when the change destination relay server 151 relays information transmitted and received between the terminal 202 and the STB 101. Contains information to use.

  With such a configuration, it is possible to perform communication between the STB 101 and the terminal 202 according to the protocol used in the relay server 151 that is the change destination.

  Further, in the stream processing apparatus according to the embodiment of the present invention, the control unit 22 uses information to be used by the relay server 151 that is the change destination when the relay server 151 relays information transmitted and received between the terminal 202 and the STB 101. When included in the information received from the terminal 202 via the relay server 151, the own STB 101 is controlled according to the information.

  With such a configuration, the STB 101 can operate by accepting a remote operation of the terminal 202 after confirming that the information is received from the terminal 202 via the specific relay server 151.

  Further, in the stream processing device according to the embodiment of the present invention, the connection processing unit 24 changes the relay server 151 of the communication connection destination every predetermined time.

  In this way, the configuration in which the relay server 151 of the communication connection destination is changed in the STB 101 at every predetermined time improves the security level of communication between the STB 101 and the relay server 151, and an appropriate relay according to the situation of the network 11 The server 151 can be selected.

  In the stream processing apparatus according to the embodiment of the present invention, terminal 202 is a portable information terminal.

  With such a configuration, it is possible to improve the convenience of a user who owns a portable information terminal that moves not only in the house but also in a wide area outside the house.

  In the remote control system according to the embodiment of the present invention, STB 101 processes a stream including information on one or more programs. The plurality of relay servers 151 relay information transmitted and received between the terminal 202 and the STB 101. The STB 101 performs an operation according to information relayed by the relay server 151. When the STB 101 changes the communication connection destination relay server 151, the STB 101 maintains the communication connection established between the change source relay server 151 and itself, and the communication between the change destination relay server 151 and itself. Process to establish connection. Then, after the communication connection between the change-destination relay server 151 and itself is established, the STB 101 performs processing to disconnect the communication connection between the change-source relay server 151 and itself.

  As described above, after establishing communication connection between the STB 101 and the change-destination relay server 151, the STB 101 is configured to disconnect the communication connection between the STB 101 and the change-source relay server 151. The communication connection destination can be changed while maintaining the state where the communication connection with at least one of the previous relay servers 151 is established.

  In the remote operation system according to the embodiment of the present invention, authentication server 161 authenticates STB 101 and terminal 202. When the STB 101 changes the communication connection destination relay server 151, the STB 101 transmits an authentication request to the authentication server 161. When the authentication server 161 receives the authentication request from the STB 101, the authentication server 161 performs device authentication processing on the STB 101. If the device authentication processing is successful, the address of the change destination relay server 151 and the change destination relay between the STB 101 and the terminal 202 are performed. Communication information used when transmitting / receiving information via the server 151 is transmitted to the STB 101. The STB 101 uses the address and communication information received from the authentication server 161 to perform a process of establishing a communication connection between the change destination relay server 151 and itself.

  As described above, the configuration in which the authenticated STB 101 and the relay server 151 to be changed are in communication connection can prevent the STB 101 having no legitimacy from establishing communication connection with the relay server 151.

  Thereby, in the remote operation system 10, for example, unauthorized access by the STB 101 having no legitimacy can be eliminated, so that the security level in the remote operation system 10 can be improved.

  In the remote control system according to the embodiment of the present invention, authentication server 161 stores a table in which device identification information for identifying STB 101 and terminal identification information for identifying terminal 202 are associated with each other. A storage unit. When changing the communication connection destination relay server 151, the STB 101 transmits its own device identification information to the authentication server 161. Upon receiving the authentication request and device identification information from the STB 101, the authentication server 161 performs device authentication processing on the STB 101. If the device authentication processing is successful, the authentication server 161 transmits the address and the communication information to the STB 101, and Based on the table, the communication information and the terminal identification information are stored in association with each other. Upon receiving the terminal identification information from the terminal 202, the authentication server 161 performs a terminal authentication process on the terminal 202. If the terminal authentication process is successful, the authentication server 161 corresponds to the address of the change destination relay server 151 and the terminal identification information. The communication information to be transmitted is transmitted to the terminal 202.

  With such a configuration, the information transmitted / received between the change-destination relay server 151 and the STB 101 can be associated with the information transmitted / received between the change-destination relay server 151 and the terminal 202 in the change-destination relay server 151. it can.

  Thereby, transmission / reception of information via the relay server 151 can be performed between the STB 101 and the terminal 202.

  Further, the STB 101 can operate by accepting a remote operation of the terminal 202 after confirming that the information is received from the terminal 202 via the specific relay server 151.

  Further, in the remote operation system according to the embodiment of the present invention, the load management server 111 measures the processing load in each relay server 151 or sets the relay server 151 to be changed to which the STB 101 should establish a communication connection. The relay server 151 is selected according to the processing load.

  With such a configuration, the processing load of each relay server 151 in the remote operation system 10 can be leveled.

  In the remote control system according to the embodiment of the present invention, the authentication server stores a table in which device identification information for identifying a stream processing device is associated with terminal identification information for identifying a terminal. However, the present invention is not limited to this. For example, another device such as a load management server connected to the network 11 may include a storage unit.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

10 Remote Operation System 11 Network 21 Communication Unit 22 Control Unit (Remote Operation Processing Unit)
23 instruction receiving unit 24 connection processing unit 25 authentication processing unit 26 stream processing unit 27 timer 101 STB (stream processing device)
111 Load Management Server 121 Display Device 151 Relay Server 161 Authentication Server 171 Distribution Server 201 Radio Base Station Device 202 Terminal 203 Gateway

Claims (14)

A stream processing apparatus for processing a stream including information of one or more programs,
According to information received from the terminal via a relay server for relaying information transmitted and received between the terminal and the stream processing device, a remote operation processing unit for controlling the own stream processing device;
A connection processing unit for performing communication connection establishment processing and disconnection processing between the relay server and its own stream processing device;
When changing the relay server of the communication connection destination, the connection processing unit maintains the communication connection established between the relay server of the change source and its own stream processing device, A process of establishing a communication connection between the change destination relay server, which is the relay server, and the stream processing apparatus of its own,
The connection processing unit performs a process of disconnecting a communication connection between the change source relay server and the own stream processing apparatus after the communication connection between the change destination relay server and the own stream processing apparatus is established. A stream processing device to perform. The stream processing device further includes:
An authentication server for authenticating the stream processing device and the terminal and an authentication processing unit for performing authentication processing;
The authentication processing unit transmits an authentication request to the authentication server when changing the relay server of the communication connection destination,
The authentication processing unit communicates, as information for the authentication request, when transmitting / receiving information between the address of the change destination relay server and the own stream processing device and the terminal via the change destination relay server. Information from the authentication server,
The stream processing apparatus according to claim 1, wherein the connection processing unit performs a process of establishing a communication connection between the change destination relay server and its own stream processing apparatus using the address and the communication information.   The stream processing apparatus according to claim 2, wherein the communication information includes information used by the remote operation processing unit when the remote operation processing unit performs cryptographic communication with the terminal via the change destination relay server.   The information for communication includes information used by the change-destination relay server when the change-destination relay server relays information transmitted and received between the terminal and the stream processing device. Stream processing device.   The remote operation processing unit receives information used by the change-destination relay server from the terminal via the relay server when the relay server relays information transmitted and received between the terminal and the stream processing device. 5. The stream processing apparatus according to claim 1, wherein the stream processing apparatus controls its own stream processing apparatus in accordance with the information when included in the information.   The stream processing apparatus according to claim 1, wherein the connection processing unit changes the relay server that is a communication connection destination every predetermined time.   The stream processing apparatus according to claim 1, wherein the terminal is a portable information terminal. A stream processing apparatus for processing a stream including information of one or more programs;
A remote operation system comprising a plurality of relay servers for relaying information transmitted and received between a terminal and the stream processing device,
The stream processing device performs an operation according to the information relayed by the relay server,
The stream processing device is the relay server of the change destination while maintaining the communication connection established between the relay server of the change source and itself when changing the relay server of the communication connection destination Perform processing to establish a communication connection between the change destination relay server and itself,
The stream processing apparatus is a remote operation system that performs processing of disconnecting a communication connection between the change source relay server and itself after the communication connection between the change destination relay server and itself is established. The remote control system further includes:
An authentication server for authenticating the stream processing device and the terminal;
The stream processing device transmits an authentication request to the authentication server when changing the relay server of the communication connection destination,
When the authentication server receives the authentication request from the stream processing device, the authentication server performs device authentication processing on the stream processing device,
When the device authentication processing is successful, the authentication server is used for communication when transmitting / receiving information between the address of the change destination relay server and the stream processing device and the terminal via the change destination relay server. Information to the stream processing device,
The remote operation system according to claim 8, wherein the stream processing device performs processing for establishing a communication connection between the change destination relay server and itself using the address and the communication information received from the authentication server. The remote control system further includes:
A storage unit for storing a table in which device identification information for identifying the stream processing device and terminal identification information for identifying the terminal are associated;
The stream processing device transmits its device identification information to the authentication server when changing the relay server of the communication connection destination,
When the authentication server receives the authentication request and the device identification information from the stream processing device, the authentication server performs device authentication processing on the stream processing device,
When the device authentication process is successful, the authentication server transmits the address and the communication information to the stream processing device, and associates the communication information with the terminal identification information based on the table. Hold
When the authentication server receives the terminal identification information from the terminal, the authentication server performs a terminal authentication process on the terminal,
The remote operation according to claim 9, wherein, when the terminal authentication process is successful, the authentication server transmits the address of the change destination relay server and the communication information corresponding to the terminal identification information to the terminal. system. The remote control system further includes:
Load for measuring the processing load in each relay server or selecting the change-destination relay server from which the stream processing apparatus should establish a communication connection from among the relay servers according to the processing load The remote control system according to any one of claims 8 to 10, comprising a management server. A communication control method in a stream processing apparatus for processing a stream including information of one or more programs,
Performing a process of establishing a communication connection with a relay server for relaying information transmitted and received between the terminal and the stream processing device;
Performing an operation according to information received from the terminal via the relay server;
When changing the relay server of the communication connection destination, the communication connection with the change destination relay server which is the relay server of the change destination while maintaining the communication connection established with the relay server of the change source A step of establishing a process;
And a step of performing a process of disconnecting the communication connection with the change source relay server after the communication connection with the change destination relay server is established. A stream processing apparatus for processing a stream including information of one or more programs;
A remote operation method in a remote operation system comprising a terminal and a plurality of relay servers for relaying information transmitted and received between the stream processing device,
The relay server relaying information transmitted from a terminal to the stream processing device;
The stream processing device performing an operation according to the information relayed by the relay server;
When the stream processing apparatus changes the relay server of the communication connection destination, the stream processing apparatus is the relay server of the change destination while maintaining the communication connection established between the relay server of the change source and itself A step of establishing a communication connection between the change destination relay server and itself;
The stream processing apparatus includes a step of performing a process of disconnecting the communication connection between the change source relay server and itself after the communication connection between the change destination relay server and itself is established. A communication control program used in a stream processing apparatus for processing a stream including information of one or more programs,
On the computer,
Performing a process of establishing a communication connection with a relay server for relaying information transmitted and received between the terminal and the stream processing device;
Performing an operation according to information received from the terminal via the relay server;
When changing the relay server of the communication connection destination, the communication connection with the change destination relay server which is the relay server of the change destination while maintaining the communication connection established with the relay server of the change source A step of establishing a process;
A communication control program for executing a step of performing a process of disconnecting the communication connection with the change source relay server after the communication connection with the change destination relay server is established.

Images