The invention consists of a new form of digital media document comprising content, applications and services that facilitate sharing and social expression on the Internet within a unified media object instead of being confined to specific websites such as social-networking services. The system identifies the driver and retrieves a data record for that driver containing the driver’s history of recent driving. The extending direction of at least one of the one end portion and the other end portion of the groove portion heater wire is inclined with respect to the depth direction of the groove.