PURPOSE: To easily identify a call to itself by providing a means storing a slave set ring tone incoming pattern and a tone color code to a master set and providing an incoming tone generation control means and an information display control means to a slave set.

CONSTITUTION: When an incoming call signal whose synchronism A from a wired telephone circuit 40 is inputted to a master set 1, an incoming call detection circuit 10 detects the signal, a control circuit 17 retrieves synchronism information from a storage circuit 15 and slave set ring synchronism tone color information relating to coincident synchronism information is sent to a slave set 2 via a coding circuit 14 and a transmitter-receiver 13. A transmitter-receiver 23 of the slave set 2 receives the slave set ring synchronism and tone color information from the master set 1, demodulates it and a decoding circuit 24 decodes the demodulated information, a control circuit 27 allows an incoming tone generating circuit 28 to generate an incoming tone based on the slave set ring synchronism and tone color information and the information relating to the synchronism A is displayed on a display device 30 via a drive circuit 29. An incoming signal whose synchronism is B is processed similarly.