1. A multi-pass image forming apparatus comprising: a plurality of developers for forming a plurality of electrostatic latent images using toners having different polarities and colors in one development process and for forming a multi-color image in at least two development processes; an exposure unit for forming the plurality of the electrostatic latent images on a photosensitive medium; and an intermediate transferring unit for having toner images transferred thereon from the photosensitive medium that overlap to form the multi-color image.