To provide an image synthetic processor, etc., capable of fast and also stably performing image synthesis of images obtained by dividingly photographing an original where images having different attributes such as a character and a photograph are mixed.

This image synthetic processor is provided with an area discriminating means S4 which discriminates between a character image area and a multilevel image area about images to be pasted together, a plurality of positional deviation detecting means S3 which detect positional deviation by a method being suitable for the attribute of the image area, a plurality of pasting together means S5 which paste images together by a method being suitable for the attribute of the image area on the basis of the positional deviation detected by the means S3 and an image synthesis controlling means that selects a positional deviation detecting means S3 and an image pasting together means S5 which are suitable for the attribute of the image area on the basis of image area discrimination results by the means S4 and makes the means S3 and S5 operate.