1. An image processing device comprising: a frame image generation device to generate a frame image in which a first image and a second image are arranged next to each other; and a compression processing device to compress the frame image in units of macroblocks, wherein each of the macroblocks has a same predetermined pixel area size, and wherein the frame image generation device causes an image boundary between the first image and the second image to coincide with boundaries of a number of the macroblocks by inserting an amount of dummy data to both sides of the first image and the second image which are opposite the image boundary so as to have a whole number of macroblocks in the first image and in the second image along a direction of arrangement.