When a problem occurs with the system or all other equipment related to automatic control, the content of the problem is accurately judged closely maintaining cooperative relation with the operator, and the operator is requested to take an action for the matters which can be temporarily taken care of while a member of Shina is dispatched to take a quick action. If a fixed IP has been given, as the system can be remotely accessed from the head office of Shina, more accurate diagnoses and actions can be carried out. Also, when a new technology has been developed, the system can be upgraded only by replacing the firmware in the on-site controller.