The present specification relates to a smart watch, a display device, and a method of controlling therefor, and more particularly, if a display unit of the smart watch and a display unit of the display device face an identical direction, to a method of providing contents related to each other to each of the display units. The smart watch includes a communication unit to transmit a connection signal and a position state of the smart watch to a display device and receive an execution signal of a first content from the display device, a display unit to display the first content, a sensor unit to detect the position state of the smart watch, a camera unit to sense an image in a front direction, and a processor to control the communication unit, the display unit, the sensor unit, and the camera unit and execute a received control signal.