A control apparatus comprises a determination unit configured to determine a region defined by a pair of first coordinate values and a pair of second coordinate values which are designated on a captured image displayed on a display unit; a display control unit configured to control the display unit to display, when the region exceeds a display range of the captured image in accordance with an operation of designating at least one of the pair of first coordinate values and the pair of second coordinate values, a predetermined image including at least a part of the region on a portion that has exceeded the range while holding the region; and an output unit configured to output a command for obtaining a captured image corresponding to the region displayed and controlled by the display control unit.