PURPOSE: To decrease number of wirings and to make wiring operation easy by performing lighting display in all units to be connected by input of lighting display data from an input side connector of lighting display unit of the one end.

CONSTITUTION: A lighting display data signal is given from a control device via signal lines TL1-TL4, and a operation command signal is supplied via a signal line DL1. A display control section 4of a first lighting display unit 2 latches and outputs the lighting display data signal supplied to a lighting display section 3 side based on the operation command signal, therefore, lighting display is continuously performed in the lighting display section 3. This operation command signal is sent from a terminal D of an input side connector 6 to a terminal D1 of an output side connector 7 in the first lighting display unit 2, also sent to a terminal D1 of an input side connector 6 of a second unit 2, and sent to a display control section 4 of the second unit 2. That is, lighting display data is sent to all units 2 by input of the one end.