Provided is a controller including an image processor and an image forming device, both performing calibration, and the controller includes a hardware processor that: associates first calibration data indicating a first calibration result with second calibration data indicating a second calibration result, and stores the first and second calibration data; compares the obtained first calibration data with the stored first calibration data, and determines whether the stored first calibration data includes data equal to the obtained first calibration data; and, when there is no data equal to the obtained first calibration data, creates the second calibration data to be associated with the obtained first calibration data by performing the second calibration, and, when there is data equal to the obtained first calibration data, creates the second calibration data to be associated with the obtained first calibration data, using the second calibration data stored and associated with the equal data.