PURPOSE: To ensure various functions to each other among telephone sets in addition to various conditions of the multiaddress communication without impairing the proper purpose of the telephone, by separating the originating or incoming from the multiaddress communication system by the will of the subscriber although the multiaddress communication function is provided.

CONSTITUTION: A telephone exchange subscriber line receives the supply of the multiaddress communication information from one of unspecified plural subscribers TEL0∼TELn. When the multiaddress communication information given among telephone exchange subscriber terminals 0∼n corresponding the telephone exchange subscriber lines is received, the subscriber line is set at a high level of impedance to a telephone exchange EX in terms of AC. The subscriber line is separated from the multiaddress communication system when the telephone exchange is connected through the subscriber telephones TEL0∼TELn. The incoming is given to the terminals 0∼n corresponding to a subscriber passed through the exchange EX from unspecified plural subscribers. At the same time, the multiaddress communication information is supplied from the originating subscriber to the multiaddress communication system via the terminals 0∼n.