A location judgment unit (411) judges whether an installation location of a base station (10) is in a first area corresponding to a service area of a first network operator. A frequency determination unit (412) determines, by using a first procedure, a radio frequency for use in wireless communication between the base station (10) and a mobile station (30) when the installation location of the base station (10) is in the first area, and determines the radio frequency of the base station (10) by using a second procedure different from the first procedure when the installation location of the base station (10) is outside the first area. The second procedure includes: receiving information on a frequency available in the installation location of the base station (10) from a frequency management system (50) that manages a frequency of a second area including the installation location of the base station (10); and determining a radio frequency of the base station (10) based on the frequency information.