A variable printing system includes: an image forming apparatus including an engine for variable printing; a device communicatively connected to the image forming apparatus; a first control section included in one of the image forming apparatus and the device; and a second control section included in one of the image forming apparatus and the device. The first control section acquires setting information of the engine corresponding to a job instructing variable printing, and performs one of adding the setting information into the job, and storing the setting information in a form of a database. The second control section analyses an output result of a job which has been executed and setting information of the engine corresponding to the job, and instructs the engine, based on a result of the analysis, to change a setting of the engine corresponding to a job to be executed or being executed.