A printer includes a communicating unit that receives a print job being a unit of execution of a printing process of a first printing protocol and a second printing protocol. The first printing protocol contains a series of process instructions and print data that allow the printing process to be performed from an interrupted point when the printing process is resumed after being interrupted. The printer also includes a print processing unit that performs the printing process by executing the print job, and a priority processing unit that preferentially selects a print job of the first printing protocol related to the interrupted printing process when receiving a print job of the first printing protocol related to the interrupted printing process and a print job of the second printing protocol after the printing process of the print job of the first printing protocol is interrupted.