A center control unit (11) of a center unit (4) generates assessment information corresponding to the strictness of the usage conditions for a specified component based on operation data stored in an operation data accumulation unit (13) received by an in-vehicle terminal (2) and assessment regulations stored in an assessment regulation storage unit (14), and generates report information for displaying a report in a form allowing comparison of this generated assessment information to relative comparison assessment information stored in an assessment information storage unit (15). A transmitter-receiver (12) transmits the report information generated by the center control unit (11) to a user terminal (3).