The invention comprises: an air-discharging device that discharges air from a discharging port; a processing unit for performing the processing that moves an object inside an object space; an air-discharging device control unit for controlling the air-discharging device on the basis of the processing results of the processing unit; an image-generating unit for generating a three-dimensional image of the object; and a display unit that displays the three-dimensional image. When an object is positioned in a first area that, when seen from the viewing point, is in front of the projection surface in the object space, the invention discharges air from the discharging port of the air-discharging device.