A control method applied to a photographing apparatus that includes a lens, an external device, and a body communicatively connected to the lens and the external device. The control method includes the body sending a shutter opening command to the lens; the lens sending a trigger signal to the body according to the shutter opening command, the trigger signal including a first pulse and a second pulse; and the body receiving the trigger signal sent from the lens, triggering a resetting operation of an image sensor inside the body according to the first pulse and triggering activation of the external device according to the second pulse.