MONITORING APPARATUS, MONITORING PROGRAM, AND MONITORING METHOD

A monitoring apparatus that is for installation in a vehicle, is to be communicably connected to a vehicle-mounted update apparatus that stores configuration information of a vehicle-mounted ECU that is to apply an update program, and monitors the vehicle-mounted update apparatus. The monitoring apparatus includes: a control unit that obtains the configuration information of the vehicle-mounted ECU from the vehicle-mounted update apparatus, and, if previously obtained first configuration information and most recently obtained second configuration information are different, the control unit determines that the vehicle-mounted update apparatus has been replaced and executes predetermined processing.