A document reading apparatus includes an integral display portion integrally provided with the area sensor portion and a main CPU for controlling screen display of the integral display portion, in which a document placed on a screen of the integral display portion is read by the area sensor portion. The integral display portion has an operation area for displaying various operation keys of the document reading apparatus on its screen, and the main CPU detects an area of the document placed on the screen by the area sensor portion and sets an area other than an area where the document is placed as the operation area of the document reading apparatus.