To provide a technique that enables easy determination of an appropriate correction value used to obtain a weight set for a transmission signal.

An interference wave direction transmission power of transmission signals from a reference antenna and a determination target antenna is measured for which weights obtained by setting correction values for weights obtained based on reception signals are set. The interference wave direction transmission power is measured while changing a value of a phase component or an amplitude component of the correction value for the determination target antenna. When it is determined that there exists the minimum value among at least three measurement values, the value of the phase component or the amplitude component of the correction value corresponding to the minimum value is adopted as an appropriate value. When it is determined that there does not exist the minimum value, the interference wave direction transmission power is measured for a new value of the phase component or the amplitude component of the correction value and determines whether there exists the minimum value among at least three measurement values including a measurement value obtained through the measurement.