To provide a method for enabling a control station to recognize a communication status within a communication disabled range in suitable timing, when there is a possibility that communication of another control station to which a terminal station is not connected, becomes an interference signal in communication between the control station and the terminal station.

When wireless connection with a terminal station is completed, a control station transmits to the wirelessly connected terminal station an intercept request signal for intercepting a control signal transmitted by another control station and returning information about the intercepted control signal. On the basis of the information returned from the terminal station, the control station arranges a band so as not to overlap the communication band of the other control station. The control station then starts communicating with the terminal station by the use of the arranged band.