1. A print data transmitting apparatus for transmitting print data to an image forming apparatus having a function of creating a printed material including a plurality of pages by inserting a plurality of sheets of special paper constituting one set into a predetermined position one by one, the print data transmitting apparatus comprising: a number-of-constituent-sheets acquiring section for acquiring the number of sheets constituting one set of special paper; and an insertion information inputting section for receiving designation of insertion page position where special paper is to be inserted in the printed material, with using a unit of number of the page positions, the number of the page positions being equal to the number of sheets constituting one set of special paper.