A radio base station 200 includes a call process controller 105 and a baseband processor 109. The call process controller 105 notifies the baseband processor 109 of an offset of the baseband resource when accepting the priority call. The baseband processor 109 changes the baseband resource to be allocated to the normal call in a predetermined cycle and applies a resource use restriction based on the offset notified from the call process controller 105, the resource use restriction restricting the baseband resource to be allocated to the normal call within a range defined by subtracting the offset from a total baseband resource.