An image processor includes a main body and a consumable product which is replaceably installed to the main body is provided with a storage configured to store a table to which a record indicative of a usage status of the consumable product is to be successively added, an installation detection unit configured to detect that the consumable product is newly installed, a judging unit configured to judge whether the newly installed consumable product has been used in the main body continuously or discontinuously when the detection unit detects that the consumable product is newly installed. A usage status detection unit detects the usage status of the consumable product. A controller updates the latest record of the table if the consumable product has been continuously used, while creates a new record to be added to the table if the consumable product has been used discontinuously.