To shorten the time that communication is instantaneously interrupted when a mobile station searches a switching destination base station while continuing the communication.

At the time of sending out control information, a base station 50 makes it correspond to different slots for respective frames and transmits it. The mobile station 80 selects the slot for the communication and receives information at the time of receiving transmission information from the base station 50 and receives the control information from the other base station at a timing different from the reception timing of the slot for the communication when communication information is degraded accompanying movement.