A III-nitride semiconductor laser device includes a laser structure including a support base, a semiconductor region, and an electrode. A third resolver detects, as a motor rotation angle, a rotation angle of an output shaft of an electric motor that imparts assistance force to an output member of a steering gear having a reduction ratio that varies in accordance with a steering angle of the steering wheel from a straight ahead position. Billing information is generated based on the usage information, the customer profile information, and rate information for the service.