SESSION INFORMATION MANAGEMENT APPARATUS, SESSION INFORMATION MANAGEMENT METHOD, PROGRAM FOR ALLOWING COMPUTER TO PERFORM PROCESSING IN THE METHOD, STORAGE MEDIUM THE PROGRAM RECORDED THEREON, AND MULTICAST SERVER

摘要

PROBLEM TO BE SOLVED: To provide a session information management apparatus wherewith only legitimate group members belonging to a multicast group can receive distributed contents.

SOLUTION: The session information management apparatus in an IP (Internet Protocol) network that connects clients, for transmitting a data providing request to an upstream and receiving data from the upstream, to a server for providing requested data to a downstream, is provided with: a session information generating means for newly creating session information when a data packet is discriminated to be multicast on the basis of a prescribed identifier in a header of the data packet transmitted from the server or the client; and a data packet transmission control means for using the newly created session information to allow the server or the client in the downstream to start transmission of the data packet.

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