Image reader, display method and storage medium storing a program for display processing

An image reader, which is connected to a printer to issue a print instruction to the printer by directly transmitting image data read by the image reader to the printer, comprises a paper feed direction information acquisition unit that acquires paper feed direction information from the printer according to the print instruction; a paper information acquisition unit that acquires paper information containing size and orientation of paper from the printer according to the print instruction; and a display that displays paper state information containing an orientation of paper consistent with the direction in which the paper is discharged by the printer based on the paper feed direction information and the paper information.