JP2011180820A - Data transfer management apparatus, data transfer management method and data transfer management program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce traffic on a communication network. <P>SOLUTION: A data transfer management apparatus 1 includes a response control part 8 for, when an acquisition request for a content is received from a client apparatus 3, determining whether to be connected to a Web server apparatus 2 to acquire a content and return it to the requesting client apparatus 3 or to acquire the content from a cache area 7 of peer-to-peer communication established by client apparatuses 3 and 4 subordinate to the data transfer management apparatus 1 and return it to the requesting client apparatus 3 according to an index 5 making the content returned in the past associated with the destination client apparatus, and a response generation part 9 for making the content returned by the determination following determination by the response control part 8 associated with the requesting client apparatus 3 of a request source being the send-back destination, and registering them to the index 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a data transfer management device, a data transfer management method, and a data transfer management program that reduce the amount of communication in a communication network.

  As P2P applications that perform peer-to-peer communication (P2P communication) using a peer-to-peer (P2P) protocol spread, P2P traffic (P2P traffic) occupies the network provided by the Internet Service Provider (ISP). Has increased. A case where P2P traffic accounts for 70% of the network flow rate has also been observed.

  The reason for the increase in P2P traffic is that, for example, the distribution of video streams has become popular and the distribution of video streams has become common, and P2P applications have become practical as a method for distributing video streams. It is considered that duplicate traffic is generated without being efficiently cached at a hierarchy (for example, a proxy server).

  One of the reasons that P2P traffic is not efficiently cached by the proxy server is that the amount of individual data is large. The video stream may exceed several GB in one hour, and if a proxy server is to secure a sufficient cache, a large amount, high speed, and expensive storage are required. As another cause, in P2P, data is replicated and distributed in preparation for terminal down. In particular, in content with a high access frequency, the same data flows from various terminals of the network, and therefore it is highly possible that the identity of the data cannot be detected even if it is cached by looking at an endpoint such as a URL.

  Further, in the case of a wide area P2P that accommodates a large number of clients scattered on the Internet, routing itself that is conscious of the existing cache hierarchy that is ISP-specific knowledge is difficult.

  Patent Document 1 describes a relay server that avoids the possibility of temporarily concentrating access to a web server. The relay server described in Patent Document 1 caches content that is expected to be concentrated in a cache server under the relay server, and when a client under the relay server views the content, Browse cached content.

  Patent Document 2 describes a proxy cache system that reduces traffic on a WAN (Wide Area Network) that connects a proxy server and a web server, and increases the speed of a client browser. In the proxy cache system described in Patent Document 2, the acquisition history of data acquired from a web server is stored in the proxy server, and when the data acquisition request is received from a browser of a client under the proxy server, the data Priority is given to acquiring the data from the cache of the proxy server or the cache of another client, rather than from the web server, based on the acquisition history for.

JP 2002-197002 (paragraphs 0007-0010) JP 11-143759 A (paragraphs 0008, 0020-0023)

  However, in the relay server described in Patent Document 1, the amount of communication between the web server and the relay server can be reduced by browsing the cached content in the cache server, but all the content is stored in the cache server. Since the amount of contents to be cached increases, storage required for the cache server increases and the cost for the relay server increases. Further, when a plurality of clients under the relay server try to view the same content, there is a possibility that the load on the disk access of the cache server increases and the response to the client is delayed.

  In the proxy cache system described in Patent Document 2, the proxy server has an index indicating the relationship between the client and the content. However, since the clients do not form a P2P network, data is transferred from the cache of another client. Even in such a case, the proxy server must acquire data from another client and return it to the client that requested the data acquisition. Therefore, for example, when the load of the disk access of the proxy server cache is high, it may take a long time to respond to the data acquisition request.

  SUMMARY An advantage of some aspects of the invention is that it provides a data transfer management device, a data transfer management method, and a data transfer management program that reduce the amount of communication in a communication network.

  When the data transfer management device according to the present invention receives a content acquisition request from a client device, the data transfer management device stores data in the web server device based on an index in which the content returned in the past and the return destination client device are associated with each other. Connect to acquire content and return it to the requesting client device, or acquire content from the peer-to-peer communication cache area configured by the client devices under the data transfer management device and return it to the requesting client device A response control unit that determines whether the content is returned in accordance with the determination by the response control unit, and a response generation unit that registers the request source client device as a return destination in association with each other. To do.

  According to the data transfer management method of the present invention, when a content acquisition request is received from a client device, the data transfer management method is performed on the web server device based on an index in which the content returned in the past is associated with the return destination client device. Connect to acquire content and return it to the requesting client device, or acquire content from the peer-to-peer communication cache area configured by the client devices under the data transfer management device and return it to the requesting client device The content returned in accordance with the determination and the requesting client device as a return destination are associated with each other and registered in an index.

  The data transfer management program according to the present invention, when a content acquisition request is received from a client device to a computer, based on an index in which the content returned in the past and a return destination client device are associated with each other. Connect to the server device to acquire the content and return it to the requesting client device, or acquire the content from the peer-to-peer communication cache area configured by the client devices under the data transfer management device and request the client device A process of determining whether to return to the client, and a process of associating the content returned according to the determination with the requesting client device as a return destination and registering it in the index.

  According to the present invention, it is possible to reduce the amount of communication in a communication network.

It is a block diagram which shows the structure of the communication system containing the proxy server apparatus which is 1st Embodiment of the data transfer management apparatus by this invention. It is a block diagram which shows the detailed structure of the proxy server shown in FIG. It is a flowchart which shows the operation example of the proxy server apparatus shown in FIG. It is a block diagram which shows the structure of the communication system containing the proxy server apparatus which is 2nd Embodiment of the data transfer management apparatus by this invention. It is a block diagram which shows the structure of the communication system containing the router apparatus which is 3rd Embodiment of the data transfer management apparatus by this invention. It is a block diagram which shows the principal part of the data transfer management apparatus by this invention.

Embodiment 1. FIG.
FIG. 1 is a block diagram showing a configuration of a communication system including a proxy server device which is a first embodiment (embodiment 1) of a data transfer management device according to the present invention. With reference to FIG. 1, the structure of the communication system containing the proxy server apparatus 200 of 1st Embodiment by this invention is demonstrated.

  The proxy server device 200 is connected to the web server device 100 via a WAN (Wide Area Network) 500. The client devices 300 and 400 are connected to the proxy server device 200 via a LAN (Local Area Network) 510. Note that the communication paths of the client devices 300 and 400 are managed by the proxy server device 200.

  The proxy server device 200 includes a proxy server unit 201, a P2P index 202, and a proxy cache area 203. The content 204 is cached in the proxy cache area 203.

  The proxy server unit 201 has a proxy server function. A detailed description of the proxy server unit 201 will be described later with reference to FIG.

  In the P2P index 202, the content 204 and the client device that is the transmission destination of the content are registered in association with each other. In the P2P index 202, the client device is indicated by an identifier assigned to each client device, for example. The client device registered in the P2P index 202 indicates that the associated content has been received, and it is determined that there is a high possibility that the content is cached in the browser cache area of the client device. Is done. The P2P index 202 is stored in a storage unit (not shown) of the proxy server device 200, for example.

  The proxy cache area 203 is a storage area for registering a cache, and the content 102 received by the proxy server unit 201 from the web server unit 101 is registered in the cache as the content 204.

  The web server device 100 includes a web server unit 101 and content 102. The content 102 is original content provided by the web server unit 101.

  The client device 300 includes a browser 301, content 302, a browser cache area 303, and a P2P communication unit 304. The browser 301 can request the proxy server unit 201 to acquire content. The content 302 is content acquired by the client device 300 and is cached in the browser cache area 303.

  The P2P communication unit 304 has a function of a general P2P terminal such as a BitTorrent (registered trademark) client. The client device 300 becomes a P2P peer and performs P2P communication.

  The client device 400 includes a browser 401, content 402, a browser cache area 403, and a P2P communication unit 404. The browser 401 can request the proxy server unit 201 to acquire content. Content 402 is content acquired by the client device 400 and is cached in the browser cache area 403.

  The P2P communication unit 404 has a function of a general P2P terminal such as a bit torrent client. The client device 400 becomes a peer on P2P and performs P2P communication.

  FIG. 2 is a block diagram showing a detailed configuration of the proxy server shown in FIG. The detailed configuration of the proxy server unit 201 will be described with reference to FIG.

  The proxy server unit 201 includes a protocol processing unit 205, a cache search unit 206, a web server connection unit 207, a P2P index search unit 208, a response control unit 209, a normal response generation unit 210, and a P2P response generation unit 211.

  The protocol processing unit 205 receives a content acquisition request (specifically, an identifier of the web server device, a content address, etc.) transmitted from the browser (for example, the browser 301) of the client device to the proxy server unit 201, Process the acquisition request. The protocol processing unit 205 controls the cache search unit 206, the web server connection unit 207, and the P2P index search unit 208, collects information, and transmits it to the response control unit 209.

  The cache search unit 206 searches the proxy cache area 203 with reference to the proxy cache area 203 to determine whether the requested content and the client device associated with the content are cached in the proxy cache area 203.

  The web server connection unit 207 transmits an acquisition request for the content 102 to the external web server unit 101 via the WAN 500. The content 102 acquired by the web server connection unit 207 is returned by the normal response generation unit 210 to the browser 301 of the client device 300 that is the acquisition request source. Further, the content 102 acquired by the web server connection unit 207 is cached in the proxy cache area 203 as the content 204.

  The P2P index search unit 208 refers to the P2P index 202 and searches for a client device associated with the requested content.

  Based on the information received from the protocol processing unit 205, the response control unit 209 determines a means for returning the content to the browser 301 of the client device 300 that is the content acquisition request source. For example, returning content from the proxy cache area 203, acquiring and returning content from the external web server unit 101, or returning content from the browser cache area 403 using P2P. It is judged as a means to do.

  The normal response generation unit 210 obtains the content 102 acquired from the web server unit 101 by the web server connection unit 207 or the content 204 cached in the proxy cache area 203 according to the determination of the response control unit 209, and the browser 301 that is the acquisition request source. Return to

  The P2P response generation unit 211 instructs the P2P communication unit of the client device according to the determination of the response control unit 209, acquires content from the browser cache area on the P2P, and returns it to the browser 301.

  Note that the protocol processing unit 206, the response control unit 209, the normal response generation unit 210, and the P2P response generation unit 211 are realized by a CPU controlled according to a program, for example.

  FIG. 3 is a flowchart showing an operation example of the proxy server apparatus shown in FIG. With reference to FIG. 3, an operation performed by the proxy server device 200 illustrated in FIG. 1 when the client device 300 makes a request to acquire the content 102 of the web server device 100 will be described.

  First, the browser 301 of the client device connects to the proxy server unit 201 via the LAN 510. The browser 301 notifies the protocol processing unit 205 of the proxy server unit 201 of the identifier of the web server device 100 and the address of the content 102 (step S1).

  The protocol processing unit 205 causes the cache search unit 206 to check whether the content 102 is registered in the proxy cache area 203 (step S2).

  When the content 102 (corresponding to the content 204 shown in FIG. 1) is registered in the proxy cache area 203 (N in Step S2), the response control unit 209 issues an instruction to the cache search unit 206, and the proxy cache area The content 204 is acquired from 203. The normal response generation unit 210 returns the content 204 to the browser 301. Then, the P2P response generation unit 211 associates the content 204 with the client device 300 and registers them in the P2P index 202 (step S3).

  If the content 102 is not registered in the proxy cache area 203 (Y in step S2), the protocol processing unit 205 registers the client device associated with the content 102 in the P2P index search unit 208 in the P2P index search unit 208. It is confirmed whether it is not done (step S4).

  When the client device associated with the content 102 is registered in the P2P index 202 (for example, the client device 400 shown in FIG. 1) (N in step S4), the response control unit 209 An instruction is issued to the P2P response generation unit 211 to cause P2P communication between the P2P communication unit 304 of the client device 300 and the P2P communication unit 404 of the client device 400. The P2P communication unit 304 acquires the content 402 registered in the browser cache area 403 of the client device 400. Then, the P2P response generation unit 211 registers the content 402 and the client device 300 in association with each other in the P2P index 202 (step S5).

  In step S5, if the P2P communication unit 304 cannot acquire the content 402 from the browser cache area 403 because the content 402 is not cached in the browser cache area 403, the P2P communication unit 304 The P2P response generation unit 211 is notified that no content exists. Upon receiving the notification, the P2P response generation unit 211 deletes the index for the content from the P2P index 202. And the process shown to step S6 is performed and a content is returned to the browser 301 from the normal response production | generation part 210. FIG.

  If the client device associated with the content 102 is not registered in the P2P index 202 (Y in step S4), the response control unit 209 issues an instruction to the web server connection unit 207 to connect to the web server unit 101. Then, the content 102 is acquired from the web server unit 101 (step S6).

  The response control unit 209 registers the content 102 acquired by the web server connection unit 207 in the proxy cache area 203. Further, the response control unit 209 registers the content 102 and the client device 300 in the P2P index 202 in association with each other. Then, the normal response generation unit 210 returns the content 102 to the browser 301 (step S7).

  Actually, the response control unit 209 determines a means for returning the content in accordance with a more complicated policy than the operation example shown in FIG. The policy for determining the determination criterion of the response control unit 209 may be set in advance by the user, for example.

  The example of the policy which determines the criterion of the response control part 209 is shown. If there is target content in the proxy cache area 203, the normal response generation unit 210 returns the content. If there is no target content in the proxy cache area 203, it is determined that there is a content on the P2P. If there is a high possibility, the P2P response generation unit 211 selects a client device that is likely to hold the content. Return the indicated data. When there is no target content in the proxy cache area 203 and there is a low possibility that there is content on the P2P, the normal response generation unit 210 returns the content acquired from the external web server unit 101.

  The other example of the policy which determines the criterion of the response control part 209 is shown. The proxy cache area 203 has target content, or a client device associated with the target content is registered in the P2P index 202, and the response control unit 209 is at least one of the proxy cache area 203 and the P2P index 202 Even when it is determined that there is target content on one side, when a predetermined condition is satisfied, the response control unit 209 acquires the target content from the external web server unit 101 to the web server connection unit 207. To instruct.

  The predetermined condition is, for example, when the load of disk access in the proxy cache area 203 is high and it takes time to acquire content from the proxy cache area 203, or the number of peers of the search result by the P2P index search unit 208 And there is a high possibility that content acquisition by P2P will fail. In such a case, the web server connection unit 207 makes an acquisition request for the target content to the external web server unit 101 in advance in order to shorten the time for starting transmission of the content to the browser.

  The response control unit 209 grasps whether or not the content can be finally returned to the client device. If the content can be returned, the returned content is associated with the return-destination client device, and the P2P index is obtained. Register in 202 and prepare for subsequent searches.

  By referring to the P2P index 202, such a proxy server device 200 may notify a client device that requests acquisition of content of a client that may have been returned and held in the past. The requesting client device and the client device that may hold the content can transmit / receive the content via the LAN 510, so that the content is stored in the proxy cache area 203 of the proxy server device 200. Even if is not registered, the content can be returned without being connected to an external network (WAN 500 shown in FIG. 1). As a result, P2P traffic on the network outside the proxy server device 200 can be reduced.

  In such a proxy server device 200, the contents stored in the browser cache regions 303 and 403 of the client devices 300 and 400 can also be used as a cache. Therefore, the size of the cache region of the proxy cache region 203 of the proxy server device 200 Larger size data can be cached. As a result, the cache hit rate including the proxy cache area 203 and the browser cache areas 303 and 403 is improved, and the overall cache effect is enhanced, so that the P2P traffic of the external network can be reduced.

  Also, such a proxy server device 200 automatically configures a P2P communication network (P2P network) when receiving a content acquisition request from a client device and returning the content by P2P communication. That is, the proxy server device 200 can implement a P2P network without a bootstrap server or a login server that is generally required when configuring a P2P network.

  When using the proxy server device 200, unlike the wide area P2P in which it is difficult to know in advance the network topology of connected clients, the proxy server is often arranged based on the physical topology. Thus, a P2P network considering the arrangement of client devices is constructed.

  For example, it is assumed that one proxy server device that manages a plurality of client devices arranged in an apartment house is arranged in one apartment house. Assume that the clients arranged in the apartment house are connected to the proxy server device at a communication speed of 100 Mbps for downlink and 30 Mbps for uplink. At this time, if one client device requests acquisition of content, the proxy server device is set to return content from 3 to 4 client devices, the requesting client device High-speed data reception using all of the above can be performed.

  Also, in such a proxy server device 200, only when it is determined that there is a merit of using P2P communication, the browser cache area of the client device is used as a cache, and the content is returned by P2P communication. In other words, depending on the situation, the return of content from the external web server unit 101 and the return of content by P2P communication can be combined, so the response time for content acquisition requests can be shortened and the throughput can be improved. be able to.

  In such a proxy server device 200, since the proxy server unit 201 manages all client devices on the P2P network, it is possible to strictly determine the identity of data transmitted from each client device. In other words, the proxy server unit 201 can know the location of the latest data without consuming the cache area by caching the latest data in the proxy cache area 203 for P2P communication, and can efficiently establish the P2P network. Can be managed.

Embodiment 2. FIG.
FIG. 4 is a block diagram showing a configuration of a communication system including a proxy server device which is the second embodiment (embodiment 2) of the data transfer management device according to the present invention. The configuration of the proxy server apparatus 220 of the second embodiment is the same as the configuration of the proxy server apparatus 200 shown in FIG. The configuration of the client devices 310 and 410 is the same as the configuration of the client devices 300 and 400 shown in FIG. 1 except that the P2P communication unit having the P2P function is not provided.

  In the communication system illustrated in FIG. 4, the proxy server apparatus 220 transmits and provides P2P modules 311 and 411 to the client apparatuses 310 and 410, respectively. The P2P modules 311 and 411 are functional modules that exhibit the P2P function by being incorporated in the browser of the client device. When the client devices 310 and 410 download the P2P modules 311 and 411 and incorporate them into the respective browsers, the browsers 301 and 401 having the P2P function are realized.

  After the P2P function is added to the client devices 310 and 410, the proxy server device 220 acquires the content acquisition route requested by the client devices 310 and 410 in the same manner as the operation of the proxy server device 200 of the first embodiment. Judging.

  Such a proxy server device 220 dynamically assigns the P2P function of the client. Therefore, even when the client devices 310 and 410 that do not have the P2P function connect to the proxy server device 220, the P2P that the proxy server unit 201 has Can be linked with functions. Even in response to a content acquisition request from a client device that does not have a P2P function, the content in the external network can be reduced and the content can be returned.

Embodiment 3. FIG.
FIG. 5 is a block diagram showing a configuration of a communication system including a router device which is the third embodiment (embodiment 3) of the data transfer management device according to the present invention.

  As shown in FIG. 5, the router device 230 includes a P2P index 202 in addition to the network monitoring unit 231. The network monitoring unit 231 monitors communication from the client devices 300 and 400 to the web server 100. When the content is returned to the client device 300 or 400, the network monitoring unit 231 associates the returned content with the return destination client device and registers them in the P2P index 202.

  The network monitoring unit 231 acquires content by connecting to an external web server device with respect to a client device that has requested acquisition of content from an external web server according to a predetermined criterion, or a client device on P2P And instructing whether to acquire content through P2P communication.

  For example, when the network monitoring unit 231 detects that the client device 300 has requested acquisition of the content 102 of the web server unit 101, the network monitoring unit 231 refers to the P2P index 202, and the client device associated with the content 102 and the content 102 Check if it is registered.

  When the client device 400 is registered in the P2P index 202 in association with the content 102, the network monitoring unit 231 performs P2P communication with the client device 400 on the P2P communication unit 304 of the client device 300, and the content. Instruct to get. The P2P communication unit 304 performs P2P communication with the P2P communication unit 404, and the browser 301 acquires the content (corresponding to the content 402 shown in FIG. 5) from the browser cache area 403.

  When the network monitoring unit 231 detects that the browser 301 has acquired the content, the network monitoring unit 231 registers the content and the P2P index device 300 in association with the P2P index 202.

  When the content requested to be acquired is not registered in the P2P index, the network monitoring unit 231 acquires the content 102 from the web server unit 101 by connecting the browser 301 to the external web server device 100. To instruct.

  Since the router device 230 does not have a proxy cache area for caching content, the content cannot be returned from the cache area to the client device. However, by returning the content on the P2P connected via the LAN, P2P traffic in the network can be reduced. If a large amount of content is cached in a cache area on P2P connected by a LAN, a higher P2P traffic reduction effect can be expected.

  In the third embodiment, since the router device 230 that does not include a storage for the proxy cache area is used, the cost for the data transfer management device can be reduced.

  FIG. 6 is a block diagram showing the main part of the data transfer management device according to the present invention. As shown in FIG. 6, the data transfer management device 1 (for example, equivalent to the proxy server device 200 shown in FIG. 1) makes a content acquisition request from the client device 3 (for example, equivalent to the client device 300 shown in FIG. 1). When received, based on the index 5 (for example, corresponding to the P2P index 202 shown in FIG. 1) in which the content returned in the past and the client device of the return destination are associated with each other, the web server device 2 (for example, The content is acquired by connecting to the web server device 100 shown in FIG. 1 and returned to the requesting client device 3, or the client devices 3 and 4 under the data transfer management device 1 (for example, in FIG. Peer-to-peer communication cache area 7 (for example, FIG. 1). A response control unit 8 (e.g., corresponding to the response control unit 209 shown in FIG. 2), a response control unit that determines whether content is acquired from the browser cache area 403 shown in FIG. A response generation unit 9 (for example, corresponding to the P2P response generation unit 211 shown in FIG. 2) that associates the content returned in accordance with the determination of 8 with the requesting client device 3 that is the return destination and registers them in the index 5. It is comprised so that it may be provided.

  In addition, in the data transfer management device of each of the embodiments described above, data transfer management devices as shown in the following (1) to (4) are also disclosed.

(1) The response control unit preferentially selects to return the content from the cache area of the peer-to-peer communication, rather than acquiring and returning the content from the web server device (for example, step of FIG. 3) This is realized by the operations shown in S4 to S5.)

(2) A proxy cache unit (for example, corresponding to the proxy cache area 203 shown in FIG. 1) that registers content acquired by connecting to the web server device as a cache is provided, and the response control unit registers the index and the proxy cache unit. Based on the situation, the content is obtained by connecting to the web server device and returned to the requesting client device, or the content registered in the proxy cache unit is returned to the requesting client device, or the proxy server device The data transfer management device (for example, the operations shown in steps S1 to S7 in FIG. 3) determines whether to acquire the content from the cache area of peer-to-peer communication configured by the client devices under the control of the client device and return it to the requesting client device. Realized).

(3) The response control unit uses the registration status of the index and the proxy cache unit, and a predetermined policy set in advance (for example, a policy for determining the determination criterion of the response control unit 209 described in the first embodiment). A data transfer management device that determines whether content is acquired from a web server device, returned from a proxy cache unit, or acquired from another client device.

(4) Data transfer management device (for example, implementation) that transmits a function module (for example, equivalent to the P2P module 311 shown in FIG. 4) to a client device that does not have a peer-to-peer communication function. This is realized by the proxy server device of aspect 2.)

  The present invention can be applied to fields such as video stream distribution, music distribution, and software online update distribution. According to the present invention, as the number of clients under the control of the data transfer management device increases, it is possible to distribute content to clients at high speed without reducing the load on the distribution server and to reduce traffic in the communication network.

DESCRIPTION OF SYMBOLS 1 Data transfer management apparatus 2 Web server apparatus 3, 4 Client apparatus 5 Index 6, 7 Cache area 8 Response control part 9 Response generation part 100 Web server apparatus 101 Web server part 102 Content 200 Proxy server apparatus 201 Proxy server part 202 P2P index 203 Proxy Cache Area 204 Content 205 Protocol Processing Unit 206 Cache Search Unit 207 Web Server Connection Unit 208 P2P Index Search Unit 209 Response Control Unit 210 Normal Response Generation Unit 211 P2P Response Generation Unit 220 Proxy Server Device 230 Router Device 231 Network Monitoring Unit 300 , 400 Client device 301, 401 Browser 302, 402 Content 303, 403 Browser cache area 304 404 P2P communication unit 310 410 Client device 311 411 P2P module 500 WAN
510 LAN

Claims (9)

When a content acquisition request is received from a client device, the content is obtained by connecting to the web server device based on an index in which the content returned in the past and the return destination client device are associated with each other. A response control unit that determines whether to return to the original client device or to acquire the content from the peer-to-peer communication cache area configured by the client devices under the control of the data transfer management device and return the content to the requesting client device; ,
A data transfer management device, comprising: a response generation unit that associates the content returned in accordance with the determination made by the response control unit with a requesting client device that is a return destination and registers the response in the index. The data transfer management device according to claim 1, wherein the response control unit preferentially selects the content to be returned from the cache area of the peer-to-peer communication, rather than acquiring and returning the content from the web server device. A proxy cache unit that registers content acquired by connecting to a web server device as a cache,
The response control unit obtains content by connecting to the web server device based on the index and the registration status of the proxy cache unit, and returns the content to the requesting client device or the content registered in the proxy cache unit Whether the content is acquired from the cache area of peer-to-peer communication constituted by the client devices under the control of the data transfer management device and returned to the requesting client device. The data transfer management device according to claim 1 or 2. The response control unit obtains the content from the web server device based on the index and the registration status of the proxy cache unit and a predetermined policy set in advance, returns from the proxy cache unit, or other client The data transfer management device according to any one of claims 1 to 3, wherein it is determined whether or not to acquire the data from the device. The data transfer management device according to any one of claims 1 to 4, wherein a function module for realizing a peer-to-peer communication function is transmitted to a client device that does not have a peer-to-peer communication function. When a content acquisition request is received from a client device, the content is obtained by connecting to the web server device based on an index in which the content returned in the past and the return destination client device are associated with each other. Determine whether to return to the requesting client device by returning it to the original client device or acquiring the content from the peer-to-peer communication cache area configured by the client device under the data transfer management device,
A data transfer management method, wherein the content returned in accordance with the determination and the requesting client device as a return destination are associated with each other and registered in the index. The data transfer management method according to claim 7, wherein priority is given to returning content from a cache area of peer-to-peer communication, rather than acquiring and returning content from a web server device. On the computer,
When a content acquisition request is received from a client device, the content is obtained by connecting to the web server device based on an index in which the content returned in the past and the return destination client device are associated with each other. Processing to determine whether to return to the requesting client device by returning the content to the original client device or having the content acquired from the peer-to-peer communication cache area configured by the client device under the data transfer management device;
A data transfer management program for executing processing for associating a content returned according to the determination with a requesting client device as a return destination and registering it in the index. On the computer,
The data transfer management program according to claim 8, wherein the data transfer management program executes a process of preferentially selecting the content to be returned from the cache area of peer-to-peer communication rather than acquiring and returning the content from the web server device.

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