To appropriately replenish developer in accordance with various kinds of original images.

In the case an exposing processing is performed by a digital exposing part based on image data, the image ratio is calculated, based on the image data and developer replenishing amount is individually calculated based on the image ration (120). In the case the image of a photographic print is exposed so as to be copied by a copying exposure part, the image ration is calculated, based on the quantity of light reflected on the photographic print and the developer replenishing amount is individually calculated, based on the image ratio (122). In the case the image of a negative film is exposed by an analog exposure part, the developer replenishing amount is individually calculated based on the previously set image ratio and a processing amount (124). The individual replenishing amount calculated in accordance with each exposure part is integrated so as to calculate an actual replenishing amount (126). In the case the actual replenishing amount becomes equal to or exceeding a unit replenishing amount (yes at 128), the developer is replenished by the unit replenishing amount.