A method of controlling a printer including a feeder on which plural printing mediums are set, a first roller operable to pickup the plural printing mediums one by one from the feeder, and a second roller operable to transport the plural printing mediums together with the first roller, the plural printing mediums include at least one first medium and a second medium subsequent to the first medium includes: controlling the first and second rollers so that a peripheral speed of the first roller and a peripheral speed of the second roller are equal to each other; and controlling the feeder so that the first roller cannot pickup the second medium from the feeder when receiving the printing instruction for performing the printing operation to only the first medium.