Abstract: A controller creates a file of image data picked up, downloaded by a communication function, or annexed to a received mail and stores it in a RAM. When an album mode is selected, the controller creates a thumbnail(s) of the image(s) file stored in the RAM and stores them on an album management table. The controller then develops the thumbnails in a display buffer according to the content of the album management table. When the controller receives an image of an image file with copyright protection information, it creates thumbnail data from the image of the received image file. Then, the controller also develops this thumbnail data in the display buffer. The controller then simultaneously displays the thumbnails developed in the display buffer on a main display unit such that sources of the thumbnails can be recognized at a glance. When the album mode ends, the display buffer is then cleared.