To provide an image forming apparatus and an image forming method by which a processing solution is stable to improve the stability of colors or the like in a formed image even when an image much print in a K-color form is formed.

The method for forming an image is carried out by exposing a sheet type recording medium comprising a silver halide color photographic sensitive material based on image information and successively developing in a plurality of process tanks to form an image on the recording medium. In the method, area information of each color plate of YMCK is obtained based on the image information, a replenishing amount of at least one process solution in a plurality of process tanks is calculated according to the area information of each color form of YMC, and a replenishing amount relating to the K-color form calculated from the area information of the K-color form is added to the above replenishing amount.