A print image generation unit performs a first rasterization process for printing and thereby generates print image data. A print unit performs printing based on the print image data and thereby produces a print product. An image scanning unit performs image scanning of the print product and thereby generates scan image data. Further, the print image generation unit performs a second rasterization process for inspection and generates reference image data of plural reference images that have plural slant angles in a predetermined range, respectively; and an inspection processing unit determines a skew angle of the scan image data, selects a reference image corresponding to the slant angle among the plural reference images, and compares the reference image data of the selected reference image and the scan image data and thereby performs inspection of the print product.