Multicast layered system, the distribution server, address allocation server and multicast distribution method

摘要

PROBLEM TO BE SOLVED: To distribute only multicast data corresponding to a device in use.;SOLUTION: A receiving terminal 10 receives data such as a motion image. A distribution server 20 distributes the data such as a motion image by multicast. An address allocating server 30 allocates a multicast address. A database 40 of terminal performance manages information about terminal performance unitarily and centrally. A network 50 transmits the information as an IP packet.;COPYRIGHT: (C)2003,JPO