The present invention has an object to provide a mechanism which gives an output result desired by the user when printing a document comprising a plurality of paper sizes in mixture. In the information processing unit disclosed in the embodiments, when paper sizes are mixed, a printing job having job attributes including standard paper information for primarily specifying a direction of paper feeding as to the paper sizes placeable in longitudinal and lateral directions in a printing control unit. In the printing control unit, it is determined from which of a plurality of paper feeding means permitting both longitudinal and lateral paper arrangement the paper is to be fed, regarding the standard paper information and the paper sizes placeable longitudinally and laterally.