US Patent 7197126 Human communication system

A client terminal 201 comprises a presence provider 222 which sends information on a user's location to a presence server 110, a space modeling means 221 which calculates the user's location in a virtual space, an audio renderer 216 which controls sound effects based on the user's location in the virtual space, a graphics renderer 219 which generates image data based on the user's location in the virtual space, and a policy session control unit 223 which controls a communication session, to realize conversations between a plurality of users utilizing the virtual space.