A carry-in ready period calculation part calculates a candidate of a carry-in ready period which is a period during which a carry-in operation can be conducted and outputs the candidate in an output part so as to make entire construction works efficient. The calculation is performed based on a site arrival time schedule which is a time schedule showing when a carry-in target equipment arrives at a site, a temporary placement time schedule which is a time schedule showing when the equipment arrived is temporarily placed, and a construction time schedule of a building in which the equipment is carried.