To cope with a plurality of possible combinations of actuators to be installed in an air-conditioner and actuators to be installed in each room while using the same facilities.

Assuming that facilities are actual controlled objects, where a cooling actuator 11, a heating actuator 12 and a humidifying actuator 13 are installed in each of the plurality of rooms 1, control is carried out as if facilities could be controlled objects, where the air-conditioner having at least one type of these actuators is used in common in the plurality of rooms 1. When calculating a manipulated variable to be output to the actuators 11, 12, 13, a controller 2 calculates the manipulated variable under such constrained conditions that the common manipulated variable is given to the actual actuator in each room in the case of the actuator which is assumed to exist in the air-conditioner only.