PURPOSE: To call a called party being an object of talking immediately by providing an incoming call display means for at least one of a display device displaying the content of an identifier when an identifier is read from an information element field between users in an incoming message and a voice synthesis circuit sending the content of the identifier in addition to the call signal tone in voice.

CONSTITUTION: In case of making a call from a telephone set 1 to A being one of users of a telephone set 7, the uppermost stage of a dial button 31 of the telephone set 1 is depressed. A call message is processed by a converter 8, and as a result, an incoming message storing A as the identifier in the information request field 23 between users is sent to a subscriber line 11 of the subscriber number N1. A telephone set 7 receiving the incoming message displays the called party name A from the identifier A stored in the element field 23 for the inter-user information on a display device and calls the called party name A in voice in succession to the forecast tone. Then the called party name called responds immediately.