Provided is an image input device which includes a laser range finder and a camera, and is capable of automatically calibrating the laser range finder and the camera at an appropriate timing without using special equipment. The sent mail is read by a support server, the support server extracts maintenance information that best suits the contents of the sent mail from a database, and sends it as maintenance information mail to the mail server in reply to the mail. The temperature voltage is combined with a compensating voltage to trim the circuit and set trip point.