Patent ID: 7702804

Claim:
A communication relay method performed by a relay device that relays communication between two computers, the method comprising: receiving a request information for establishing a connection with the two computers, the request information including instruction information relating to contents being received and/or sent after establishing the connection; adding a designation header to the request information; transmitting the request information including the designation header to a relay computer; controlling, based on the designation header, whether the relay computer adds first additional data to first contents and establishing the connection with the two computers via the relay computer; transmitting the first contents between the two computers after establishing the connection; receiving the first contents transmitted from a sender among the two computers to a destination of the first contents as a payload; accumulating the first additional data to be added to the first contents; determining, based on the designation header sent to the relay computer, a procedure for adding the first additional data to the first contents; transmitting second contents containing the first contents and the first additional data as a payload to the destination based on a result of the determining; and wherein the first contents to be received in the receiving contain image data and/or audio data.