To achieve cooperative printing from a color image forming apparatus which corrects a registration deviation in an inner part of the image forming apparatus connected to a network to the color image forming apparatus which corrects the registration deviation with an information processor.

Density correction information inherent in an apparatus and information about the registration deviation are preliminarily reported from the color image forming apparatus which corrects the registration deviation with the information processor and appropriate correction processing is executed by a transmission source so as to enable cooperation. Also, if a cooperation destination is the color image forming apparatus which corrects the registration deviation in the inner part of the image forming apparatus, the cooperation is executed by directly transmitting image data without executing the correction processing.