A refrigerant circuit includes a heat source unit including a compression element and a radiator and a plurality of cooling units each including an evaporator and performing or stopping cooling operation depending on a difference between a temperature of a target to be cooled and a set temperature. A control unit outputs information indicative of a capacity required of the heat source unit on the basis of first information that is usable for deriving a cooling capacity required of each of the plurality of cooling units and second information indicative of the temperature of the target to be cooled and the set temperature in each of the plurality of cooling units.