PURPOSE: To improve the utilizing efficiency of a radio communication line and to attain incoming call to a district with weak radio wave by providing a mobile station, a radio base station, an automobile telephone control station, an exchange station and plural subscriber telephone sets and adding a caller number to a call signal of the mobile station in addition to the mobile station number to be called.

CONSTITUTION: When an incoming call is given to the automobile telephone control station 3 from a general exchange station 4, the station 4, the station 3 collects an incoming number and a caller number. Then the station 3 transmits a call signal to the mobile station 1. In order to show the call from the automobile telephone station 3 to a caller, the station 3 transmits a tone signal or cuts off the line. When a call signal to the mobile station 1 exists, the mobile station 1 stores a caller number and displays the callout. In this case, however, a radio talking line is not automatically set. When a subscriber hooks of a handset or enters the operation for talking, the mobile station 1 makes call processing at first to a subscriber telephone set 5 of the caller.