To provide a print result that is easy for a user to view by preventing, for example, image data from crossing a fold when the printed paper is folded in the middle.

It is determined whether or not a user sets perfecting (S201), and if perfecting is set, a common area of printable areas on obverse and reverse sides is calculated (S202). If N-page printing is set (S203), it is determined whether or not centering is necessary according to the value of N. If N is an even number, that is, if it is determined that an even number of images, such as two or four, are printed on a single side (S204), centering is performed (S205).