PURPOSE: To speedily and easily confirm a connector used for a communication between a switchboard and a radio telephone terminal in a field.

CONSTITUTION: This system is equipped with a switchboard 5, plural radio telephone terminals 7 having displays 6, which move in a radio area, and plural connectors 8 wire-connected with the switchboard 5, which operate a radio communication with the terminals 7, and the terminal 7 is connected through the closest connector 8 with which the radio communication can be operated by the terminal 7, with the switchboard 5. Also, the switchboard 5 is equipped with a detecting means 9 which detects the connecting position of the connector 8 with the switchboard 5, and a storage means 10 which preliminarily stores the connector information of the connector 8 including the connector number. Then, the connector information of the connector 8 which is used at present by the terminal 7 is displayed on the display 6 of the terminal 7 by inputting a prescribed number instead of a number inputted from the terminal 7 at the time of a normal calling.