A print process of body text and a 2-sided print process of tab paper sheets are done by a single operation from a PC. Body text data and one face of each tab paper sheet undergo a print process, only tab paper sheets are set in a tray again, and a print instruction is issued to execute a print process of only the other face of each tab paper sheet. Alternatively, after only one face of each tab paper sheet undergoes a print process, a print process of the other face of each tab paper sheet is executed together with body text data. In this case, an information processing apparatus issues commands and data required to execute the print process on the printing apparatus side.