1. An image editing apparatus configured to perform ganging of a plurality of content images on a printing plate capable of transferring ink onto an output medium, comprising: a region dividing unit that two-dimensionally divides a predetermined region on the printing plate into a plurality of sub regions; a priority order giving unit that gives an order of priority of disposition to each of the sub regions divided by the region dividing unit in a descending order of relative transfer amounts of the ink onto the output medium; a usage amount estimating unit that estimates respective usage amounts of the ink according to two or more content images out of the plurality of content images; and a disposition determining unit that determines respective disposing positions of the content images according to a disposition rule for sequentially disposing the content images of which the usage amount is estimated to be large by the usage amount estimating unit in the sub regions having high priorities given by the priority order giving unit.