A gesture control method includes steps of capturing at least one image; detecting whether there is a face in the at least one image; if there is a face in the at least one image, detecting whether there is a hand in the at least one image; if there is a hand in the at least one image, identifying a gesture performed by the hand and identifying a relative distance or a relative moving speed between the hand and the face; and executing a predetermined function in a display screen according to the gesture and the relative distance or according to the gesture and the relative moving speed.