An image forming apparatus has an image reading unit which reads an image, a photographing unit, a storing unit, a printing unit, a detecting unit, a notifying unit, an extracting unit, and a displaying unit. When the detecting unit detects untaken printed paper, the notifying unit notifies a user to promote reading of the image of the untaken printed paper by the image reading unit. The extracting unit extracts the data of the image of at least one part other than the face of the whole body of the user photographed by the photographing unit from the image of the printed paper read by the image reading unit. The displaying unit displays the image of at least one part other than the face of the whole body of the user extracted by the extracting unit.