A server includes a transceiver and a controller. The transceiver is configured to facilitate communication with a plurality of image forming apparatuses. The controller is configured to receive adjustment information from each of the plurality of images forming apparatuses, determine an updated adjustment value to be used in each of the plurality of image forming apparatuses based on the adjustment information received from of each of the plurality of image forming apparatuses, and transmit adjustment update information including the updated adjustment value to each of the plurality of image forming apparatuses.