The printing system comprises: a print data generating unit for generating print data; an image data generating unit for generating image data for each page having a data size of an integral multiple of a specified block size based on the print data; a delivering unit for delivering the image data; an imposing unit for imposing the image data in such a way that images for a plurality of pages will be printed on a sheet of paper; and a printing unit for printing images for a plurality of pages on a sheet of paper, wherein a process for preventing a blank space being formed in a boundary area between the images to be printed on a sheet of paper due to padding data added to the image data in order to make data size of the image data to be an integral multiple of the block size, is executed.