An image formation apparatus comprises: an image exposure portion that forms a latent image by optically exposing a recording medium based on entered image data; a thermal development portion that visualizes the latent image by heating the recording medium exposed by the image exposure portion; at least one counter each of which counts the number of a set of the image data whenever the image data is entered; and a data-processing portion that: rotates, through 180°, (i) images represented by those of the set of the image data with the counted number of even or (ii) images represented by those of the set of the image data with the counted number of odd; and then outputs the image data to the image exposure portion.