PURPOSE: To execute a countermeasure to restore an action at the time of replacing a battery in a minimum memory area by providing a means for outputting a code showing that a film is being rewound, which has the code showing that the film is being rewound stored at a storage address in an EEPROM for storing data from starting rewinding the film till finishing it in the case of starting rewinding the film.

CONSTITUTION: The means 3c for outputting the code showing that the film is being rewound is provided, which has the code showing that the film is being rewound stored at the storage address A in the EEPROM 2 for storing the data from starting rewinding the film till finishing it in the case of starting rewinding the film. Therefore, data communication for updating the counted number of the film is not executed at the time of rewinding the film. Then, a memory area where the code showing 'the film is being rewound now' is stored is also used as a memory area where the counted number of the film is stored, which is usually used as the memory area for storing the counted number of the film. At the time of rewinding the film, it is used as the memory area for storing the code showing 'the film is being rewound now'. Thus, the countermeasure to restore the action at the time of replacing the battery is performed in the minimum memory area.