To reduce a time required for printing processing using an electronic sort function.

In printing of a first copy, image data of a page which require a longer generation time are preferentially stored in an image data storage unit. In printing of a second or later copy, a page in which image data are stored in the storage unit 24 is printed by using the image data, and a page in which image data are not stored is printed by acquiring data which require less time to be printed out from among printing data and image data from an information processing device 10.