To allow a user to freely set a layout when printing display contents of a display device.

This display device is provided with a second memory part retaining print screen data to be printed by an image data output device 10 separately from a first memory part for retaining the display screen data to be displayed on a display system. This printing method is provided with a step wherein the display system creates the print screen data based on the preset print format and printing object items, a step wherein the display system converts the print screen data created based on preset attributes of the print into image data, a step wherein the display system transmits the image data to the image data output device 10, and a step wherein the image data output device 10 executes the print based on the received image data received.