1. An image processing system comprising: a server to control a plurality of processes performable in the image processing system; a first image forming apparatus communicable with the server; and a second image forming apparatus communicable with the server, wherein the server includes: a first memory to store first image processing data being applicable to an image process to be performed on a target image to be output; and a first processor to generate first image drawing information based on the first image processing data, to be referred by the first image forming apparatus in performing an image forming operation based on output target image information, and wherein the second image forming apparatus includes: a second memory to store second image processing data being applicable to the image process to be performed on the target image to be output; a second processor to generate second image drawing information based on the second image processing data, to be referred by the second image forming apparatus in performing an image forming operation based on the output target image information received from the server; and a print engine to perform the image forming operation of the second image forming apparatus based on the second image drawing information.