An apparatus which is capable of attaching maintenance part that needs replacement accompanying use and includes: storage unit configured to store a prediction equation of a life of the maintenance part in a plurality of patterns in a storage device; reception unit configured to receive, from a user, switching instructions to switch a prediction equation currently being applied to a prediction of a life of the maintenance part to one of a plurality of patterns of a prediction equation stored in the storage unit for the maintenance part; switching unit configured to switch a prediction equation currently being applied to a prediction of a life of the maintenance part to a prediction equation specified by the switching instructions; and presentation unit configured to present identification information on a prediction equation currently being applied to a prediction of a life of the maintenance part to a user.