An interface accesses a server for managing usage of a plurality of frequency resources allocated to a first wireless system and acquires information indicating the usage. Based on the acquired information, a control unit selects, amongst the frequency resources, a frequency resource to be used by a second wireless system. The control unit determines whether, after the information is acquired at a first time point, reacquisition of the information at a second time point is successful, which second time point is scheduled to reacquire the information from the server. If the reacquisition is unsuccessful, the control unit allows a frequency resource for the second wireless system to be selected based on the information acquired at the first time point even from the second time point onward.