The embodiment of the invention provides an image forming device. The image forming device comprises an operation part for displaying a set picture and receiving set input from a user, a control part for determining processing content relevant to image forming according to the set input and executing processing relevant to the image forming according to the determined processing content, a writing part for writing history information about the processing executed by the control part into a portable storage medium, and a reading part for reading the history information written into the portable storage medium, wherein the operation part displays the set picture based on the history information read by the reading part. Through the image forming device in the embodiment, a last used function or frequently-used functions can be displayed for the user according to records saved in a card and set content, so that input time can be saved for the user, and input errors are avoided.