Abstract: A printer includes a plurality of cassettes and a cassette is selected from the cassettes. The printer comprises a print information memory, paper information memory, cassette information memory, cassette selector, and data editor. The print information memory stores print information contained in print data therein. The print information includes a size of the print paper and an orientation of the print paper with respect to a direction of travel of the print paper. If a size of print paper specified by the print information is different from a size of print paper accommodated in a paper cassette selected last time, a first paper cassette is selected which accommodates print paper of a size specified by the print information. If the print information specifies print paper of a same size as the print paper accommodated in a paper cassette selected last time, a second paper cassette is selected which accommodates print paper oriented in a way different from the cassette selected last time.