To provide a printer in which various kinds of setting can be made when a confidential job is printed and print results can be obtained in a format expected by a confidential job receiver.

The printer comprising a plurality of sheet feed stages 7, a plurality of sheet discharge stages 8, a post-processor 9 including a punch and a staple, a user input means 17 (user I/F 5), and a data storage medium 2 is provided with a confidential print function for storing received data attached with a personal identification number in the data storage medium 2 and starting printing upon receiving the personal identification number from the user input means 17.