Provided is an image processing device capable of efficiently executing index printing based on motion picture data. A printer having a function of index-printing a plurality of frame images based on motion picture data, includes: a setting unit for setting the number of thumbnail images in the index printing; a first designation unit for designating motion picture data; a first printing unit for selecting and printing, upon dividing the designated motion picture data into a plurality of partial motion picture data according to the set number of the thumbnail images, a frame image for each of the divided partial motion picture data; a second designation unit for designating specific partial motion picture data from the plurality of partial motion picture data; and a second printing unit for selecting and printing, upon additionally dividing the designated specific partial motion picture data into a plurality of partial motion picture data according to the set number of the thumbnail images, a frame image for each of the divided partial motion picture data