To provide a printing method of a printed matter for making a user efficiently perform thermal fusion work when printing the printed matter to be thermally fused using a toner thermal fusion machine with an upper limit of the number of sheets to be thermally fused simultaneously.

The information processor includes: number-of-sheet reception means for receiving the upper limit number of sheets that can be thermally fused simultaneously in a toner thermal compression bonding device in which thermal fusion using toner is performed; print instruction reception means for receiving a print instruction to print data; addition means for adding additional print data for attaching the toner to the print data received by the print instruction reception means; and instruction means for instructing a printer to divide the print data by the number of sheets less than the upper limit number of sheets and discharging them when the number of sheets to print the print data to which the additional print data is added by the addition means exceeds the upper limit number of sheets received by the number-of-sheet reception means.