Patent ID: 7031659

Claim:
A communication system comprising a plurality of communication devices which each communicate with another communication device from among said plurality of communication devices by obtaining an address of the other communication device, wherein a different address is assigned to each of said plurality of communication devices, and wherein one of said plurality of communications devices comprises: a first obtaining unit operable to obtain a set of identification information assigned to each user, and a respective address of each other communication device among said plurality of communications devices from each other communication device; a registering unit operable to associate each address obtained by said first obtaining unit with a respective identification information obtained by said first obtaining unit and with a respective priority, and to register the associated address, identification information and priority into said registering unit; a second obtaining unit operable to obtain one of the set of identification information assigned to each user; and a specifying unit operable to search said registering unit for the identification information obtained by said second obtaining unit, specify one of said plurality of communication devices as a target communication device when the one of said plurality of communication devices has the address registered in said registering unit which is associated with the identification information obtained by said second obtaining unit and when the identification information obtained by second obtaining unit is registered in said registering unit, and specify another one of said plurality of communication devices as the target communication device when the another one of said plurality of communication devices has an address which is registered in said registering unit with a highest priority and when the identification information obtained by said second obtaining unit is not registered in said registering unit.