To issue tickets of paper and cards for customers who need them as commemoratives on the basis of information acquired at the purchase of the tickets, and to provide other mementos such as albums by on-demand printing.

This on-demand printing service system is equipped with a user terminal for a user to apply for an on-demand product through a communication line, a sales server which requests, through a communication line, the manufacturing of the on-demand product of a specification in accordance with contents that accept the application, and a manufacturing system which manufactures the on-demand product of the specification upon receipt of the manufacture request. The manufacturing system is equipped with an editing means which edits printing data on the basis of the specification, an on-demand printing machine which obtains a printed matter by printing the printing data to predetermined printing paper based on the specification, and a product processing means which performs the product processing of the printed matter to a form based on the specification.