An image file imaged by a digital camera is stored in a memory card, and the digital camera sets the number of prints for each image file according to the digital print order format (DPOF) standard and records the number as a printing information file in the memory card. When the number of prints is set, an image file in which at least one frame is designated for printing is determined to have a read-only file property in order to prevent the image file from being erased against the designation for printing. There is provided a mode for collectively designating all frames for printing.