A printing service system comprises a portal site computer connected to a portable terminal and a print station via a network. The portal site computer transmits the contents of which reservation for printing has been made by the portable terminal to the print station via the network, and prints out them. The portal site computer establishes a printing reservation site for reserving printing of contents via the network, and stores reservation information on contents in which the portable terminal accesses to the printing reservation site, thereby making a reservation for printing, corresponding to user identification information on the portable terminal. When the portal site computer receives the user identification information transmitted from the print station, it reads the reservation information on the contents corresponding to the received user identification information. Then, the portal site computer transmits the contents corresponding to the read reservation information to the print station. Thus, a place for requesting contents and a place for reserving contents printout are not constrained.