A radio network controller which includes radio resource administration means for administrating a state of the use of radio resource, rack information administration means for administrating a state of the use of resource at base band signal processing unit in base transceiver station, and control means for selecting a call frequency used in base transceiver station and allocating it to a certain rack of base band signal processing unit. In the above configuration, a percentage of loss calls which occurred due to an insufficiency of empty amount with the radio resource, or of empty amount with the base band resource, can be lowered.