To reduce traffic on a communication network.

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.