A standardized information acquirer acquires standardized information from an electric device. A standardized telegraphic message sender sends a standardized telegraphic message including the standardized information to a communication device. An unstandardized information acquirer acquires unstandardized information from the electric device. A standardized telegraphic message receiver receives the standardized telegraphic message including the standardized information. An electric device determiner determines whether the electric device meets a specific condition based on the standardized information included in the received standardized telegraphic message. When the electric device is determined to meet the specific condition, an unstandardized telegraphic message sender sends the unstandardized telegraphic message including the unstandardized information. An unstandardized telegraphic message receiver receives the unstandardized telegraphic message including the unstandardized information.