| 摘要 |
<p>PROBLEM TO BE SOLVED: To indetify a plurality of groups and to conduct efficient transmission and reception for each group by providing a terminal identifier comparison means that compares a group identifier with an identifier in received terminal equipment information and recognizes it that a participation terminal equipment is changed when both participation terminal identifiers differ. SOLUTION: When a transmission instruction is received, a packet management section 210 of a multi-cast communication processing section 200 designates a transmission destination terminal identifier to a terminal information generating section 222 to instruct generation of a packet header. The generated packet is sent out of a transmission section 250 to a network. On the other hand, the packet reached to a reception section 260 is separated into a header part and a communication text by the packet management section 210. The header part is identified by a terminal information identification section 232 and a group information identification section 231 and when the packet is not addressed to its own terminal, the packet is aborted. On the other hand, the group information identification section 231 compares the identifier with a terminal identifier stored in a terminal information storage section 240 to judge the destination and it is transferred to a corresponding user information processing section 100.</p> |
