It is assumed that a user changed a set value of paper selection, which is one of setting items of various setting items, from “auto” to “A3”. According to one embodiment, a controller extracts history records in which the set value of the paper selection is “A3” from setting information history in a storage, and arranges them to the side of the various setting items in chronological order. Specifically, the controller displays three pieces of setting information, starting with the latest setting information, followed by older setting information, on the right side of the various setting items. In displaying the pieces of setting information, in order to clarify and highlight parts having discrepancies relative to the set values of the various setting items, the color may be changed, a box may be used to surround such a part, or characters may be displayed in bold.