A management method is provided for a removable device attached to an apparatus and to be removed for maintenance. Maintenance data for each removable device is stored in a data management unit. An identification code is given to each removable device. The identification code of the removable device is read and input and output together with information required for maintenance, via a mobile terminal. The maintenance data is sent and received between the mobile terminal and the data management unit via a personal handphone system radio relay device. Since the management method enables maintenance of the removable device to be performed via the mobile terminal, it is possible to easily manage the location and history of the removable device requiring maintenance.