An image processing method of forming images of data onto a plurality of recording media each having an obverse surface and a reverse surface is disclosed. This method has a recognizing step of recognizing a delimiter of the data in document data and a recognizing step of, in the case where the delimiter of the data is recognized in the recognizing step when an image process is executed so as to form the image onto the obverse surface of a predetermined recording medium, recognizing an instruction showing either a mode to continue the image forming operation to the reverse surface of the recording medium or a mode to exchange the recording medium and continue the image forming operation from the obverse surface of another recording medium.