PURPOSE: To suppress the increase in a transmission delay by implementing sophisticated control for a lighting and a motor for an automobile through the use of a multiplex technology, preventing the concentration of a wire harness to a specific unit and reducing the transmission quantity of the network.

CONSTITUTION: The feeding power controller 40 provided with a multiplex control section 41, using the multiplex control section 41 to fetch a signal sent from other multiplex control means, driving a switching element 42 based on the fetched signal and supplying a power supply from a power supply device 30 to a connected lamp 33 has a table 41d storing control mode data used to apply chopper control to the connected lamp 33, reads control mode data in response to a timing signal or a selection signal subject to multiplex control from the table 41d to control an output current supplied to the lamp 33 and to implement dimmer control.