A control apparatus comprises a generation unit that generates a first synchronization signal and a second synchronization signal; and a control unit that controls the generation unit. The control unit controls the generation unit such that the first synchronization signal used to repeatedly readout a first image signal to be sequentially displayed on a display and the second synchronization signal used to display the first image signal on the display are output with a predetermined time difference. In a case where a second image signal is read out at a timing corresponding to a shooting instruction between readouts of the first image signals, the first and second synchronization signals are output with the predetermined time difference before and after the readouts of the second image signal.