Provided is an image processing device and method capable of making the joint of an original image and a reverse image less noticeable. A CPU processes image data stored in an external memory device for storing an information resource for an electronic game, and displaying the electronic game target on a screen of a display device based on the processing results. Thereupon, when generating an original image and a reverse image as a repeat image, the CPU deletes an image worth 0.5 dots of a pixel belonging to an area adjacent to the reverse image among the pixels of the original image, deletes an image worth 0.5 dots of a pixel belonging to an area adjacent to the original image among the pixels of the reverse image, generates a single image by alternately arranging the original image and reverse image where an image worth 0.5 dots was deleted, executes the embedding of an image, and thereby displays this image as the repeat image.