COMMUNICATION SYSTEM, RELAY DEVICE, CONTROL METHOD, AND RECORDING MEDIUM

摘要

The present invention enables communication between different communication networks. The communication system 1 according to the present invention has: an SMSC 14 which is provided in a mobile network 10 over which a user terminal 2 performs communication through a wireless base station, and transmits a message to the user terminal 2; a GW 21 which is provided in an autonomous distributed network 20 over which a plurality of user terminals performs direct communication, and communicates with at least one of the plurality of user terminals 2; and a relay device 32 (32a) which, upon receiving a message transmitted using a predetermined protocol from one device of the SMSC 14 and the GW 21, performs communication, which corresponds to a message received from the other device, using a protocol that is used for communication with the other device and is different from the predetermined protocol.