The present invention relates to an apparatus, such as a digital camera, in which a battery is removably loaded and a memory card is detachably inserted so that the apparatus is supplied with power from the battery and performs processing including writing data on the memory card. The invention ensures that data write inhibit operation on the memory card is performed before the memory card is removed. A memory card slot for inserting the memory card is provided inside a battery lid to be accessible by opening the battery lid. A circuit detects separation of a battery contact plate from the battery due to opening of the battery lid and turns the memory card to a write protect state.