A multi-beam image forming apparatus and a method using the same. The image forming apparatus includes: an image process module to divide first image data into a plurality of second image data; a light scanning unit to scan the plurality of second image data using a plurality of laser beams; and a controller to control the formation of an electrostatic latent image of the first image data on a photosensitive body in an overlapping manner, using at least two of the plurality of laser beams.