An image forming apparatus comprises a feed section configured to feed a medium; an image forming section configured to form an image on the surface of the medium with a thermally erasable recording material or a recording material which is not thermally erasable; a heating section configured to heat the medium; a control section configured to conduct a control in a color erasing mode. The image forming apparatus also comprises a color erasing counter configured to count up, according to the size of the medium, the number of the mediums the color of which is thermally erased in the color erasing mode; and a print counter configured to count up, according to the size of the medium, the number of the mediums on which an image is fixed in the image formation mode.