When data for printing and an authentication code are inputted, a CPU of a printer calculates a number of sheets to be used based on the data for printing. The CPU adds the calculated number of sheets to be used to the management table, based on the inputted authentication code, and rearranges the management table so that a user with a smaller number of used sheets is in a higher place. The CPU executes print processing using the inputted data for printing. The CPU acquires a display name, ranking, and the number of used sheets corresponding to the inputted authentication code from the management table in an RAM to transmit to information technology equipment.