To allow a visually handicapped person to recognize the content of a push button via voice guidance and to push a proper button by building the content of the button upon reception of the first signal from a button switch provided on a hall or a car, and processing the content of the button upon reception of the second signal.

When the press section 6 of a push button is depressed to the fixed depth, contact points 7a, 8a and contact points 7b, 8b are brought into contact with each other, output terminals 9, 10 are set to the closed state, and output terminals 9, 11 are set to the open state. When the press section 6 is depressed to the full stroke, the contact points 7a, 8a, the contact points 7b, 8b, and contact points 7c, 8c are brought into contact with each other, and the output terminals 9-11 are set to the closed state. When the button is depressed to the fixed depth, the first signal is transmitted from the button to a control device, and a guidance request signal is outputted to a voice guide device. When a user depresses the button to the full stroke after recognizing the button content, the second signal is transmitted to the control device to process the content and outputted to an operation control device.