1. A camera control apparatus connected to a plurality of cameras via a network, the plurality of cameras each having a color adjustment unit adapted to perform color adjustment of a sensed image, the camera control apparatus including: a receiver adapted to receive sensed images from the plurality of cameras; a camera designation unit adapted to designate, from the plurality of cameras, a reference camera used as a color reference for the plurality of sensed images received from the plurality of cameras and to change the designated reference camera based on a sensed image; an adjustment value determination unit adapted to determine a color adjustment value for another camera based on the sensed image of the reference camera and sensed image of the another camera; and a transmitter adapted to transmit the color adjustment value and a command to control the color adjustment unit to execute color adjustment based on the color adjustment value to the another camera via the network, wherein the camera designation unit changes the designated reference camera based on an elapsed time period after a previous change of the reference camera.