A control apparatus configured to control a flash such that the flash emits light in synchronization with exposure of an image capture apparatus, includes a wireless communication device configured to perform wireless communication with the flash; and a controller configured to control the wireless communication device, wherein in a period from when the image capture apparatus starts exposure to when the flash emits light, the wireless communication device repeatedly transmits a signal to the flash at a predetermined time interval in order to prevent the flash from transitioning to a power-saving state.