According to the present invention, it is possible, by using the first and second light source loci, to tone down the influence of the object color of the color information in the image and detect the light source based on the color information having the influence of the object color toned down so as to detect the light source accurately. The test lung is in the form of a compact unit and permits the simulation of different lung types by adjustment of the lung parameters. A call is assigned to an elevator car to carry a passenger belonging to the one service group while the elevator car is assigned to carry or is already carrying another passenger belonging to the different service group. The second set of symbols are not initially displayed to a player.