To display an image list stored in a memory with good visibility and to display the image list at a high speed, an image display device reads an image file in an Exif format, extracts a thumbnail image included in the image file in the Exif format, and generates a displayed image having a predetermined size and a square shape, thus displaying it in the image list. It is possible to improve visibility in displaying the image file aligning square-shaped displayed image having the same size while precluding blanks. It is possible to perform high-speed processing in producing an image list using thumbnail images included in image files in the Exif format.