Output image data, which is composed of a plurality of pages, and output configuring information are stored temporarily in a file spool in an intermediate data format using an information processing apparatus. The size in which a prescribed page is to be output is acquired by a spool file manager from the temporarily stored output configuring information of the output image data in the intermediate data format. The size of each page of the output image data is changed by a despooler based upon the output size acquired.