Provided is a method of operating, when a load of a base station is changed, based on a load of a backhaul of another base station. An aspect of the present invention includes, in a communication system including a first backhaul (4) between a base station (100) and a core network (3) connected to the base station (100) and a second backhaul (5) between an adjacent base station (101) and the core network (3) connected to the adjacent base station (101), a calculation unit (10) configured to calculate a load of the second backhaul (5) when a load of the base station (100) is changed; and a determination unit (20) configured to determine as to whether or not the load of the base station (100) is changed based on a result of the calculation by the calculation unit (10).