In an image processing apparatus, a predetermined processing is performed in response to occurrence of an abnormal condition that an image forming job cannot be executed. A first processing is preset for the apparatus as a common processing to respond to the abnormal condition. A second processing is set for the image forming job as a processing to respond to the abnormal condition. Either the first processing or the second processing is selected according to priorities assigned thereto. The selected processing is performed in response to occurrence of the abnormal condition when the abnormal condition occurs. The processing to handle the abnormal condition can flexibly be selected from among a plurality of processings according to the environment in which the printer system is placed.