JP5037004B2 - Terminal equipment and communication system - Google Patents

Description

  The present invention relates to a terminal device, a server, and a communication system, and more particularly to a technique for two devices to perform peer-to-peer (P2P) communication.

  In recent years, with the establishment of broadband environments such as xDSL and optical fiber, the Internet has been rapidly spreading regardless of companies and general households. In addition to personal computers (PCs), home appliances such as televisions, DVD recorders, air conditioners, and refrigerators can be connected to the Internet.

  When a device connected to a local area network (hereinafter referred to as “LAN”) in a home or a company connects to the Internet via a LAN, a Network Address Translation (hereinafter referred to as “NAT”) function or a Network Address Port Generally, a router having a translation (hereinafter referred to as “NAPT”) function (also referred to as “IP masquerade function”) is used.

  When devices connected to the Internet communicate with each other, a global IP address uniquely assigned to each device is used. Due to the rapid increase in devices connected to the Internet, the number of global IP addresses tends to be insufficient. For this reason, devices that are not directly connected to the Internet but are connected to the LAN are often assigned private IP addresses that are defined in RFC 1918 and are unique only within the LAN. Private IP addresses are not unique on the Internet and are not allowed to be used. Therefore, a device to which only a private IP address is assigned cannot communicate with other devices connected to the Internet as it is.

  The NAT function and the NAPT function solve these problems. A device connected to the LAN, to which a private IP address is assigned, performs mutual conversion between a private IP address and a global IP address, is connected to the Internet. To communicate with the device.

  The so-called Internet may be referred to as WAN (Wide Area Network) in order to clearly distinguish from the LAN. In addition, since the NAT function and the NAPT function are similar in nature, when it is not necessary to distinguish between them, the NAT function and the NAPT function are described as the NAT function as a representative.

  In an environment where the NAT function is used, whether two terminal devices that perform P2P communication are connected to the same LAN or the Internet is a condition that greatly affects the operation of communication. For example, when two terminal devices that perform P2P communication are connected to the same LAN, the security of communication may be lowered as compared to the case where they are connected via the Internet, and the communication band may be arbitrarily set. Can take big. On the other hand, when two terminal devices that perform P2P communication are connected via the Internet, it may be required to increase communication security or limit the communication band.

  Accordingly, when two terminal devices that perform P2P communication are connected via the Internet, the terminal device on the information transmission side may change the bit rate of encoding, for example, when transmitting AV content, In some cases, it is necessary to change the strength of the content or limit the content that can be transmitted.

That is, when two terminal devices are connected via the Internet, both terminal devices need to take different measures when performing P2P communication than when they are connected to the same LAN. .
JP 2004-56325 A

  However, when a user selects a connection destination device, for example, when selecting a connection destination device from a list of devices, the device directly operated by the user (hereinafter referred to as “user device”) and the connection destination device are in the same LAN. It is not obvious whether it is connected or connected via the Internet. For this reason, there is a possibility that the user device will know that the information to be transmitted must be transmitted at a low bit rate only after actually connecting to the connection destination device. In addition, the user device may transmit information to a device outside the home connected to another LAN via the Internet in a low security method suitable for the device connected to the home LAN by mistake. There is. Therefore, the user wants to know whether or not the communication partner device (connection destination device) of the user device is connected to the LAN to which the user device is connected. Furthermore, the user wants to know whether the connection destination device is a portable device, a stationary device, or a mobile device.

  The present invention provides a terminal device that can determine whether a connection destination device is connected to the same LAN or the Internet, and can select an optimal communication method. Objective. Another object of the present invention is to provide a server for specifying whether a connection destination device is connected to the same LAN or connected via the Internet.

In order to solve the above problems and achieve the above object, a terminal device of the present invention is a terminal device that is connected to a LAN connected to the Internet and communicates via the LAN, the communication partner of the terminal device An identifier of a connection destination device that is a device, a connection specific attribute value indicating whether or not the connection destination device is connected to the LAN, and whether the connection destination device is a portable device or a stationary device. Storage means for storing a list including a type specifying attribute value to be indicated; communicating with the connection destination device; determining whether the connection destination device is a portable device or a stationary device; and the connection destination device Based on the determination result obtained by the determination means and the determination result obtained by the determination means, the connection specific attribute value and the type specific attribute value And a registration means for registering in the terminal device in response to the connection specified attribute value and the type identification attribute value of the connection destination device registered in the list, the different content of coding bit rate Receive from the connected device.

  The terminal device of the present invention further communicates with the connection destination device, based on a determination unit that determines whether or not the connection destination device is connected to the LAN, and a determination result obtained by the determination unit. And registration means for registering the connection specific attribute value in the list.

  The terminal device of the present invention further includes request means for requesting transmission of information for specifying the connection specifying attribute value to a server connected to the Internet to which the LAN is connected, and from the server Receiving means for receiving connection specifying information indicating whether or not the connection destination device is connected to the LAN as a response to the request made by the requesting means, and the connection specifying attribute based on the connection specifying information Registration means for registering values in the list may be provided.

  The terminal device of the present invention further includes a determination unit that determines whether or not the connection destination device is connected to the LAN, and the connection specifying information is obtained when the connection destination device communicates via the Internet. A first global IP address to be used, wherein the determining means matches the first global IP address with a second global IP address used when the terminal device communicates via the Internet. If the connection destination device is determined to be connected to the LAN, the registration unit may register the connection specific attribute value in the list based on the determination result obtained by the determination unit. Good.

  The terminal device of the present invention is a device in which the connection destination device is further connected to the LAN based on the connection specific attribute value of the entry for an entry corresponding to the connection destination device in the list. Display means for distinguishing whether the device is not connected to the LAN.

  When the connection destination device is a device connected to the LAN, the display means displays the entry in a first connection destination list, and the connection destination device is a device not connected to the LAN. In this case, the entry may be displayed in the second connection destination list.

  The display means changes the shape or color of the entry to be displayed in the first connection destination list and the entry to be displayed in the second connection destination list, or uses a specific mark. Thus, the information may be displayed separately.

  The terminal device according to the present invention further includes an operation unit for a user to operate the connection destination device, and the display unit is executed on the connection destination device determined based on the connection specific attribute value. Possible operation contents may be included in the entry and displayed.

  The list may further include a type specifying attribute value indicating whether the connection destination device is a portable device or a stationary device.

  The terminal device of the present invention further communicates with the connection destination device, determines whether the connection destination device is a portable device or a stationary device, and the connection destination device is connected to the LAN. Determination means for determining whether or not there is, and registration means for registering the connection specific attribute value and the type specific attribute value in the list based on the determination result obtained by the determination means.

Terminal device of the present invention, further, to the connection destination device, and requesting means for requesting to transmit information for identifying the connection specific attribute value, from said connection destination device, wherein the request means is carried requested in response to, and a receiving means for the connection destination device receives a connection specific information indicating whether or not it is connected to the LAN, the registration means, based on said connection specific information, the connection specified attribute value May be registered in the list .

  The terminal device of the present invention further includes a determination unit that determines whether or not the connection destination device is connected to the LAN, and the connection specifying information is obtained when the connection destination device communicates via the Internet. A first global IP address to be used, wherein the determining means matches the first global IP address with a second global IP address used when the terminal device communicates via the Internet. If the connection destination device is determined to be connected to the LAN, the registration unit may register the connection specific attribute value in the list based on the determination result obtained by the determination unit. Good.

Terminal device of the present invention, further, to the connection destination device, and requesting means for requesting to transmit information for identifying the type specifying attribute value, from said connection destination device, wherein the request means is carried requested in response to, and receiving means for receiving a type identification information, wherein the connection destination device indicates whether it is a to or stationary equipment and portable equipment, said registration means, based on the type identification information, the type identification The attribute value may be registered in the list .

  The terminal device of the present invention further includes an entry corresponding to the connection destination device in the list based on the connection specification attribute value and the type specification attribute value of the entry, wherein the connection destination device is a portable device, a stationary device, The display device may include a display device that distinguishes between a type device that is connected to the LAN and a stationary device that is not connected to the LAN.

  When the connection destination device is a portable device, the display means displays the entry in the first connection destination list, and the connection destination device is a stationary device that is connected to the LAN. The entry is displayed in the second connection destination list, and if the connection destination device is a stationary device and is not connected to the LAN, the entry is displayed in the third connection destination list. May be.

  The display means includes the entry to be displayed in the first connection destination list, the entry to be displayed in the second connection destination list, and the entry to be displayed in the third connection destination list. They may be displayed separately by changing their shapes or colors, or by using specific marks.

The terminal device of the present invention further includes an operation unit for a user to operate the connection destination device, and the display unit is determined based on the connection specifying attribute value and the type specifying attribute value. The contents of operations that can be executed on the destination device may be included in the entry and displayed.
The terminal device according to the present invention may further communicate with the connection destination device by a communication method with lower security than when the connection destination device is connected to the LAN when the connection destination device is not connected to the LAN. .
In addition, the terminal device of the present invention further communicates with the connection destination device by a communication method having a communication band larger when the connection destination device is connected to the LAN than when the connection destination device is not connected to the LAN. May be.
Furthermore, the terminal device according to the present invention receives content based on MPEG2 from the connection destination device when the connection destination device is connected to the LAN and is a stationary device, and the connection destination device When it is not connected to the LAN and is a stationary device, content based on MPEG4 is received from the connection destination device, and when the connection destination device is a portable device, the connection destination device changes to JPEG. Based content may be received.

  The server of the present invention is a server that is connected to the Internet and communicates with the first terminal device and the second terminal device. The second terminal device is used when the second terminal device communicates via the Internet. Connection means for indicating whether or not the second terminal device is connected to the LAN to which the first terminal device is connected from the storage means for storing the global IP address and the first terminal device. A receiving means for receiving an information transmission request; a first global IP address used when the first terminal device communicates via the Internet when the receiving means receives the transmission request; Determining means for determining whether or not the two global IP addresses match, and a transmitter for transmitting the determination result obtained by the determining means to the first terminal device Provided with a door.

  The server of the present invention is a server that is connected to the Internet and communicates with the first terminal device and the second terminal device, and is used when the second terminal device communicates via the Internet. Connection specifying information indicating whether the second terminal device is connected to the LAN to which the first terminal device is connected from the storage means for storing the IP address and the first terminal device. Receiving means for receiving the transmission request, and transmitting means for transmitting the global IP address to the first terminal device when the receiving means receives the transmission request.

  The communication system of the present invention is connected to a LAN connected to the Internet, and is connected to the first terminal device, the second terminal device, and the Internet that communicate via the LAN. A communication system comprising a terminal device and a server that communicates with the second terminal device, wherein the first terminal device is an identifier of the second terminal device, and the second terminal device is connected to the LAN. Whether or not the second terminal device is connected to the LAN based on information from the server has storage means for storing a list including a connection specific attribute value indicating whether or not the device is connected. In accordance with the obtained determination result, the connection specific attribute value is registered in the list, and the second terminal device periodically transmits the identifier of the second terminal device to the server, The sir Holds the identifier of the second terminal device and the second global IP address used when the second terminal device communicates via the Internet, from the first terminal device, When receiving a connection determination information transmission request for determining whether or not the second terminal device is connected to the LAN, the second global IP is used using the identifier of the second terminal device. An address is searched to determine whether the second global IP address matches the first global IP address used when the first terminal device communicates via the Internet. The determined determination result is transmitted to the first terminal device as the connection determination information, and the first terminal device transmits the first global IP address and the second global device. When receiving the connection determination information indicating that the P address and match, determines that the second terminal device is connected to the LAN.

The communication system of the present invention is a communication system including a first terminal device connected to a LAN connected to the Internet and communicating via the LAN, and a second terminal device, The first terminal device includes an identifier of the second terminal device, a connection identification attribute value indicating whether or not the second terminal device is connected to the LAN, and the second terminal device is a portable device. storage means for storing a list containing the type specific attribute value indicating which of what is located in or stationary equipment, the second terminal equipment based on information from the second terminal device is connected to the LAN to determine dolphin not, and a judgment means for said second terminal device to determine whether it is a to or stationary equipment and portable equipment, according to the determination result obtained by said determining means, said connection specific And a registration means for registering sex value and the type identification attribute value in the list, the second terminal device, from the first terminal device, the second terminal device is connected to the LAN When receiving a connection determination information transmission request for determining whether or not the second terminal device communicates via the Internet, the first global IP address used when the second terminal device communicates via the Internet is used as the connection determination information. The first terminal device transmits contents having different encoding bit rates according to the connection specification attribute value and the type specification attribute value of the connection destination device registered in the list. Receive from the second terminal device.

  Furthermore, the present invention can be realized as a method using the characteristic constituent means of the terminal device of the present invention as steps, or as a program for causing a computer to execute those steps, or a CD- It can also be realized as a recording medium such as a ROM. The program can be distributed via a transmission medium such as a communication network.

  The present invention provides a terminal device that can determine whether a connection destination device is connected to the same LAN or is connected via the Internet, and can select an optimal communication method. it can. In addition, the present invention can provide a server for specifying whether a connection destination device is connected to the same LAN or connected via the Internet.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of a communication system according to the present embodiment. The communication system according to the present embodiment includes a terminal device 101, a terminal device 102, a router 103, and a LAN 104 that are installed in a first house 111, and a terminal device 105 that is installed in a second house 112. A router 106, a LAN 107, the Internet 108, a server 109, and a mobile terminal device 110 are configured. The router 103, the router 106, the server 109, and the mobile terminal device 110 are connected to the Internet 108. The terminal device 101 and the terminal device 102 are connected to the router 103 via the LAN 104. The terminal device 105 is connected to the router 106 via the LAN 107.

  The terminal device 101 is a connection source device and is operated by a user. In the present embodiment, the terminal device 101 is a digital AV recorder. As shown in FIG. 1, the terminal device 102 is connected via a router 103 to a LAN 104 to which the terminal device 101 is connected. In the present embodiment, the terminal device 102 is a digital AV recorder, and stores content based on MPEG2 or MPEG4.

  As shown in FIG. 1, the terminal device 105 is connected to a LAN 107 different from the LAN 104 to which the terminal device 101 that is a connection source device is connected. In the present embodiment, the terminal device 105 is a digital AV recorder, and stores content based on MPEG2 or MPEG4.

  The mobile terminal device 110 is a mobile device and is directly connected to the Internet 108 as shown in FIG. The mobile terminal device 110 can communicate with the terminal device 101 and the terminal device 102 connected to the LAN 104 via the Internet 108, and can also communicate with the terminal device 105 connected to the LAN 107. The mobile terminal device 110 stores still images based on JPEG.

  Next, the configuration of the terminal device 101 will be described. FIG. 2 is a configuration diagram of the terminal device 101. As illustrated in FIG. 2, the terminal device 101 includes a storage unit 201, a request unit 202, a reception unit 203, a registration unit 204, and a display unit 205.

  The storage unit 201 includes an identifier (ID) of a connection destination device that is a communication partner device, a connection identification attribute value that indicates whether the connection destination device is connected to the LAN 104 to which the terminal device 101 is connected, A list including a type specifying attribute value indicating whether the connection destination device is a stationary device or a portable (mobile) device is stored. The request unit 202 requests the server 109 to transmit information for specifying the connection specifying attribute value and the type specifying attribute value. The receiving unit 203 receives a response to the request made by the request unit 202 from the server 109. The registration unit 204 registers the response received by the reception unit 203 in a list stored in the storage unit 201. The display unit 205 displays information.

  Next, the configuration of the server 109 will be described. FIG. 3 is a configuration diagram of the server 109. As illustrated in FIG. 3, the server 109 includes a storage unit 301, a reception unit 302, a determination unit 303, and a transmission unit 304.

  The storage unit 301 stores information regarding each of the terminal device 101, the terminal device 102, the terminal device 105, and the mobile terminal device 110. The receiving unit 302 receives information from each of the terminal device 101, the terminal device 102, the terminal device 105, and the mobile terminal device 110. The determination unit 303 determines whether each of the terminal device 102, the terminal device 105, and the mobile terminal device 110 is connected to the LAN 104 to which the terminal device 101 is connected. The transmission unit 304 transmits the determination result obtained by the determination unit 303 to the terminal device 101.

Next, the operation of the system according to the present embodiment will be described with reference to FIGS.
FIG. 4 is a sequence diagram showing each procedure of the operation of the system according to the present embodiment.

  When the terminal device 101, the terminal device 102, the terminal device 105, and the mobile terminal device 110 are installed, the terminal device 101 registers data related to itself in the server 109. In FIG. 4, a registration phase S401 shows a communication sequence when each terminal device registers data related to itself in the server 109. In the registration phase S401, each terminal device is connected to the Internet 108 as to whether it is a device ID, which is its own identifier, whether it is a mobile device or a stationary device (router 103, Or the global IP address of 106) is registered in the server 109 (S406). Information to be registered is stored in the storage unit 301 of the server 109.

  The terminal device 101 is connected to another device according to the transition diagram shown in FIG. 5 displayed by the display unit 205, and the content (content based on MPEG2, MPEG4, or JPEG) possessed by the other device is displayed on the display unit 205. To do.

  The terminal device 101 registers an entry in the list of connection destination terminal devices stored in the storage unit 201 built in the terminal device 101 in the following procedure.

  The user first selects “connection destination device registration” in the menu 501 displayed by the display unit 205 of the terminal device 101, and transits to the device ID input screen 508. Next, the user inputs the ID of the connection destination device on the device ID input screen 508. Thereby, the terminal device 101 performs communication according to the sequence of S407 to S421 in FIG. 4, and registers an entry in the list of connection destination terminal devices according to the result.

  In S407, when the ID of the terminal device 102 is input as the ID of the connection destination device on the device ID input screen 508, the request unit 202 of the terminal device 101 makes a search request to the server 109 (S408). In the server 109, the reception unit 302 receives the search request, and the determination unit 303 determines that the global IP addresses of the terminal device 101 and the terminal device 102 match based on the information registered in the storage unit 301. Based on the determination, the terminal device 102 determines that it is connected to the LAN 104 to which the terminal device 101 is connected (S409). In the server 109, the transmission unit 304 includes information indicating that the terminal device 102 is a stationary device in the determination result obtained in S 409 and transmits the information to the terminal device 101 as a determination result 410. In the terminal device 101, the receiving unit 203 receives a determination result from the server 109 indicating that the terminal device 102 is a stationary device and is connected to the LAN 104 to which the terminal device 102 is connected, and the registration unit 203 204 registers an attribute value based on the received determination result in an entry in the list of connection destination terminal devices (S411).

  In S412, when the ID of the terminal device 105 is input as the connection destination device ID on the device ID input screen 508, the request unit 202 of the terminal device 101 makes a search request to the server 109 (S413). In the server 109, the reception unit 302 receives the search request, and the determination unit 303 determines that the global IP addresses of the terminal device 101 and the terminal device 105 do not match based on the information registered in the storage unit 301. Based on the determination, the terminal device 105 determines that it is not connected to the LAN 104 to which the terminal device 101 is connected (S414). In the server 109, the transmission unit 304 includes information indicating that the terminal device 105 is a stationary device in the determination result obtained in S412 and transmits the information to the terminal device 101 as a determination result 415. In the terminal device 101, the reception unit 203 receives a determination result from the server 109 indicating that the terminal device 105 is a stationary device and is not connected to the LAN 104 to which the terminal device 105 is connected, and the registration unit 203 204 registers an attribute value based on the received determination result in an entry in the list of connection destination terminal devices (S416).

  In S417, when the ID of the mobile terminal device 110 is input as the ID of the connection destination device on the device ID input screen 508, the request unit 202 of the terminal device 101 makes a search request to the server 109 (S418). In the server 109, the reception unit 302 receives the search request, and the determination unit 303 determines that the global IP addresses of the terminal device 101 and the mobile terminal device 110 do not match based on the information registered in the storage unit 301. Based on the determination, the mobile terminal device 110 determines that it is not connected to the LAN 104 to which the terminal device 101 is connected (S419). In the server 109, the transmission unit 304 includes information indicating that the mobile terminal device 110 is a mobile device in the determination result obtained in S419, and transmits the information to the terminal device 101 as the determination result 420. In the terminal device 101, the receiving unit 203 receives a determination result from the server 109 indicating that the mobile terminal device 110 is a mobile device and is not connected to the LAN 104 to which the receiving device 203 is connected, and the registration unit 204 However, the attribute value based on the received determination result is registered in the entry of the connection destination terminal device list (S421).

  After the terminal device 101 registers the connection destination device as described above, the user designates “NET content viewing” in the menu 501 displayed by the display unit 205 of the terminal device 101. As a result, the user can select a connection destination device by using one of the three types of lists shown on the screens 502, 503, and 504 for selecting the connection destination. The in-home device list 502 displays entries of stationary devices connected to the LAN 104 to which the terminal device 101 is connected, and the out-of-home device list 503 is connected to the LAN 104 to which the terminal device 101 is connected. The entry of the stationary device that has not been displayed is displayed, and the mobile device list 504 displays the entry of the mobile device. In each entry, the terminal device 102 is displayed in the in-home device list 502, the terminal device 105 is displayed in the out-of-home device list 503, and the mobile terminal device 110 is displayed in the mobile device list 504 according to the registered contents.

  When the user selects a device displayed on a screen for selecting a connection destination (in-home device list 502, out-of-home device list 503, or mobile device list 504), the terminal device 101 selects the selected device. To communicate with the selected device. In this embodiment, the user can view content based on MPEG2 stored in the terminal device 102 from the in-home device list 502, and is stored in the terminal device 105 from the out-of-home device list 503. The content based on MPEG4 can be viewed, and the content based on JPEG stored in the mobile terminal device 110 can be viewed from the mobile device list 504.

  Thus, the terminal device 101 can acquire the content selected by the user by the communication method according to the connection destination. In addition, since a user can recognize a communicable device for each list, it is possible to provide a GUI with good operability.

  Note that the terminal device 101 may include a determination unit that determines whether a connection destination device that is a communication partner device is connected to the LAN 104 to which the terminal device 101 is connected. For example, when the request unit 202 requests the server 109 to transmit information for specifying a connection specifying attribute value, the request unit 202 is used when the connection destination device communicates via the Internet 108 as a response from the server 109. When the global IP address is transmitted, the determination unit determines the transmitted global IP address and the global IP address (global IP address of the router 103) used when the terminal device 101 communicates via the Internet 108. In comparison, it is determined whether or not the connection destination device is connected to the LAN 104. Specifically, the determination unit determines that the connection destination device is connected to the LAN 104 only when the transmitted global IP address matches the global IP address of the router 103. The determination unit may communicate with the connection destination device and determine whether the connection destination device is connected to the LAN 104. Similarly, the determination unit may communicate with the connection destination device and determine whether the connection destination device is a mobile device or a stationary device. In any case, the registration unit 204 registers the determination result obtained by the determination unit in the list of the storage unit 201.

  The display unit 205 of the terminal device 101 changes the shape or color of the entry displayed in the home device list 502, the entry displayed in the outside device list 503, and the entry displayed in the mobile device list 504. Or by using a specific mark.

  Furthermore, the terminal device 101 may have an operation unit for the user to operate the connection destination device. In this case, the display unit 205 may display the operation content executable for the connection destination device in the entry.

  The terminal device and server of the present invention are useful as a device that communicates via a network.

System configuration diagram of the embodiment Configuration diagram of terminal device 101 Configuration diagram of server 109 Sequence diagram showing each procedure of the operation of the system of the embodiment Transition diagram displayed by the display unit 205 of the terminal device 101

Explanation of symbols

101, 102, 105 Terminal equipment 103, 106 Router 104, 107 LAN
108 Internet 109 Server 110 Mobile terminal device 201 Storage unit 202 Request unit 203 Reception unit 204 Registration unit 205 Display unit

Claims (14)

A terminal device connected to a LAN connected to the Internet and communicating via the LAN,
An identifier of a connection destination device that is a communication partner device of the terminal device, a connection specific attribute value indicating whether or not the connection destination device is connected to the LAN, and whether the connection destination device is a portable device Storage means for storing a list including a type-specific attribute value indicating whether it is a type device;
Determining means for communicating with the connection destination device, determining whether the connection destination device is a portable device or a stationary device, and determining whether the connection destination device is connected to the LAN; ,
Registration means for registering the connection specific attribute value and the type specific attribute value in the list based on the determination result obtained by the determination means;
The terminal device receives contents having different encoding bit rates from the connection destination device according to the connection specification attribute value and the type specification attribute value of the connection destination device registered in the list. Furthermore,
Request means for requesting the connection destination device to transmit information for specifying the connection specific attribute value;
Receiving means for receiving connection identification information indicating whether or not the connection destination device is connected to the LAN, as a response to the request made by the request means from the connection destination device;
The terminal device according to claim 1, wherein the registration unit includes: registering the connection specific attribute value in the list based on the connection specifying information. The connection specifying information is a first global IP address used when the connection destination device communicates via the Internet,
When the first global IP address and the second global IP address used when the terminal device communicates via the Internet match, the determination unit determines that the connection destination device is in the LAN. It is determined that it is connected,
The terminal device according to claim 2, wherein the registration unit registers the connection specific attribute value in the list based on a determination result obtained by the determination unit. Furthermore,
Request means for requesting the connection destination device to transmit information for specifying the type specifying attribute value;
Receiving means for receiving type specifying information indicating whether the connection destination device is a portable device or a stationary device as a response to the request made by the request unit from the connection destination device;
The terminal device according to claim 1, wherein the registration unit includes: the type specifying attribute value is registered in the list based on the type specifying information. Further, an entry corresponding to the connection destination device in the list is determined based on the connection specification attribute value and the type specification attribute value of the entry, and the connection destination device is a portable device, a stationary device, and the LAN. The terminal according to any one of claims 1 to 4, further comprising: a display unit that distinguishes and displays which is a device connected to the device and a device that is a stationary device and is not connected to the LAN. machine. The display means includes
If the connection destination device is a portable device, the entry is displayed in a first connection destination list;
When the connection destination device is a stationary device and a device connected to the LAN, the entry is displayed in a second connection destination list;
The terminal device according to claim 5, wherein when the connection destination device is a stationary device and is not connected to the LAN, the entry is displayed in a third connection destination list. The display means includes the entry to be displayed in the first connection destination list, the entry to be displayed in the second connection destination list, and the entry to be displayed in the third connection destination list. The terminal device according to claim 6, wherein the terminal device is distinguished and displayed by changing a shape or a color, or by using a specific mark. Furthermore, an operation means for a user to operate the connection destination device is provided,
8. The display unit includes an operation content that is determined based on the connection specific attribute value and the type specific attribute value and that can be executed on the connection destination device, and displays the operation content in the entry. The terminal device according to any one of the above. The terminal device further communicates with the connection destination device by a communication method with a lower security when the connection destination device is connected to the LAN than when the connection destination device is not connected to the LAN. The terminal device according to any one of the above. The terminal device further communicates with the connection destination device when the connection destination device is connected to the LAN by a communication method having a communication band larger than that when the connection destination device is not connected to the LAN. The terminal device according to any one of the above. Before Symbol terminal equipment,
When the connection destination device is connected to the LAN and is a stationary device, content based on MPEG2 is received from the connection destination device;
When the connection destination device is not connected to the LAN and is a stationary device, content based on MPEG4 is received from the connection destination device;
The terminal device according to claim 1, wherein when the connection destination device is a portable device, content based on JPEG is received from the connection destination device. A communication system comprising a first terminal device connected to a LAN connected to the Internet and communicating via the LAN, and a second terminal device,
The first terminal device is:
Before Symbol identifier of the second terminal device, the second terminal device is connected particular attribute value indicating whether or not it is connected to the LAN, the second terminal device is a portable device for either stationary equipment storage means for storing a list containing the type specific attribute value indicating which of what is,
Before Symbol the second terminal device determines whether or not it is connected to the LAN based on information from the second terminal device, and said second terminal device is a portable device for either stationary equipment a determining means for determining which of the or at,
In accordance with the determination result obtained by the determination means , comprising: a registration means for registering the connection specific attribute value and the type specific attribute value in the list;
When the second terminal device receives a connection determination information transmission request for determining whether or not the second terminal device is connected to the LAN from the first terminal device, A second global IP address used when the two terminal devices communicate via the Internet is transmitted as the connection determination information to the first terminal device;
The first terminal device transmits contents with different encoding bit rates from the second terminal device according to the connection specification attribute value and the type specification attribute value of the connection destination device registered in the list. Receiving communication system.   The program for functioning a computer as each means of the terminal device of any one of Claims 1-11.   The computer-readable recording medium which recorded the program for functioning a computer as each means of the terminal device of any one of Claims 1-11.

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