To decrease the circuit scale necessary for the calibration of the output circuit and to decrease the time required for the calibration operation. Then selecting, in each base station, a service to be provided on the basis of the comparison described in step, so that services of service levels independently established for every area can be provided to the mobile stations each registered in a respective one of the base stations. Elimination of such a point of connection likely reduces RF ingress into a signal path and likely reduces interference with a signal traveling through the signal path.