An image forming apparatus has an image display operation device with a function selecting portion to correlate with a plurality of functions executed in the image forming apparatus, a display portion, and a display control portion. The function selecting portion includes a function selecting portion in which selectable function items are displayed in accordance with an operation mode selected in the image forming apparatus. A second function selecting portion display other function items that are simultaneously selected. The display control portion simultaneously displays the function selecting portions on the display portion. The image display operation device simultaneously makes functions selectable. When the functions according to the first function selecting portion is selected, the display control portion changes functions according to the second function selecting portion that is displayed, based on contents of the functions according to the first function selecting portion.