1. An image forming method comprising the steps of: (a) superimposing an ink sheet on an intermediate transfer medium, the ink sheet comprising a thermally transferable ink layer, and the intermediate transfer medium comprising a support having thereon an interlayer and an intermediate image receiving layer in the order; (b) applying heat in response to an imagewise signal onto the ink sheet so as to form an ink image on the image receiving layer of the intermediate transfer medium; (c) peeling off the ink sheet from the intermediate transfer medium having the ink image; (d) superimposing a final image forming material on the intermediate transfer medium having the ink image; and (e) applying heat or pressure to the superimposed final image forming material on the intermediate transfer medium so as to transfer the ink image onto the final image forming material, wherein the image receiving layer is imagewise transferred to the final image forming material together with the ink image.