Inputs from multiple input devices including an internal input device 22, a first external input device 54, and a second external input device 56 can be made to a printing apparatus 20. The printing apparatus 20 includes a receiver 50 that receives, from a host device, a print job containing print user identification information that identifies a print user; an input controller 42 that controls any one of the multiple input devices to serve as an input device that inputs authentication information that is used for authenticating the print user identification information; an authentication information input accepting unit 44 that accepts an input of the authentication information from the controlled input device; an authentication unit 46 that authenticates the print user identification information using the accepted authentication information; and a printing unit 52 that performs printing according to the print job when the authentication is successful.