A computer-generated hologram fabrication process that enables a plurality of original images to be observed with master-slave relations Original images 11, 12, a recording surface 20 and reference light R are defined on a computer, and a number of point light sources P11-1,. According to the refrigerator, since a product having a large width and a small thickness can be stored in a standing state, it is possible to conveniently store a product such as a pizza box and efficiently use a storage space. The mounting of an operator control element on the mounting point is identified and evaluated as an activation indication of the associated functional unit. The memory device receives the control signals asynchronously, and assumes the second mode in response to one of the control signals.