To form images of pages which exceed a foldable upper limit, and to facilitate associating multiple sets of paper media with images formed thereon.
An MFP (multi function peripheral) includes: an image-forming sheet calculation part 115 for calculating the number of paper media on which images are formed when the image of image data is formed, in accordance with printing conditions; a division part 117 for dividing a plurality of pages included in the image data into a plurality of sets, when the number of sheets with images exceeds the upper limit number of sheets which can be simultaneously folded by a post-processing part; an image data change part 119 for adding the page including association information for associating the plurality of sets to the image data; and a condition change part 121 for changing the printing conditions so that the page including the association information is formed on the back of a representative paper medium in the plurality of paper media with the images for the plurality of pages belonging to each of the plurality of sets.
NISHIOKA HIROKI
MAEJIMA TOSHIYUKI
IWAMOTO HIROSHI
MORITA MITSUTAKA
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