The invention discloses an air conditioner, a control method, device and system thereof. The method comprises the steps of acquiring image information of a first indoor object; predicting the motion track of the first object according to the image information on the basis of a prediction model, wherein a plurality of indoor areas are included indoors; determining the target indoor area which the first object is about to arrive at when the first object moves according to the motion track; and controlling the air conditioner corresponding to the target indoor area to run. Through the method, thetechnical problem that air conditioners in multiple rooms cannot be controlled flexibly when a user moves between the multiple rooms indoors in the prior art is solved.`