An image processor displays a mapscroller screen including a function key display region and an icon display region. The function key display region displays a plurality of function keys arrayed in first direction while being scrollable in the first direction, the plurality of function keys receiving a setting of a function related to image processing, and the icon display region displays a plurality of icons arrayed in the first direction in an order identical to that of the plurality of function keys displayed in the function key display region, the plurality of icons corresponding to the plurality of function keys displayed in the function key display region. The image processor groups and displays, on the mapscroller screen, the function key and icon corresponding to the function, in which the setting is received when a grouping instruction is received with the settings of the plurality of functions received.