PURPOSE: To effectively utilize a speaking channel by preventing the radio speaking channel from being used in vain when it is not necessary to use a radio line.

CONSTITUTION: When a terminating call is generated from a terminal 2 on the side of a general subscriber telephone network through a subscriber line W1 to a terminal 200-1, a base station 10 calls the transfer destination of the general subscriber telephone network such as a terminal 3, for example, corresponding to the terminal 200-1 through a common subscriber line Wn+1, for example, in the case of storing the phone number of the transfer destination in a storage circuit 60 and connects the subscriber line W1 and the common subscriber line Wn+1.