A maintenance monitor mechanism 300 comprises of a maintenance control section 310 that controls and carries out remote maintenance of an apparatus-to-be-maintained, a maintenance history storage unit 320 that records maintenance history, and a display unit 350. The maintenance control section 310 acquires the date and time of the maintenance last carried out from the maintenance history storage unit 320 and displays nullMaintenance Not Problematicnull the difference between the last maintenance date and time and the present date and time does not exceed a required maintenance interval or displays nullMaintenance Problematicnull if the difference exceeds the interval. With said arrangement, it is possible to provide a remote maintenance system that informs the personnel in charge as to whether maintenance has been carried out surely and correctly and to definitely judge whether the apparatus is really in a usable condition.