A printer comprises a print head, a discharge port, a display portion, and a processor. The processor displays a head marker indicating a position of the print head and a discharge port marker indicating a position of the discharge port on the display portion in correspondence to a positional relationship of the print head and the discharge port. The processor also displays, in real-time on the display portion, an image of the print medium on which the print image has been printed, in accordance with the printing by the print head, such that the image is initially displayed in a state in which a start edge of the image is aligned with the head marker when the printing by the print head starts, and a position of the initially displayed image is moved toward the discharge port marker in accordance with progress of the printing by the print head.