A display device, comprising: a communication unit configured to receive a connection signal and a position state of a smart watch from the smart watch, and transmit an execution signal of a first content to the smart watch; a display unit configured to display a second content; a sensor unit configured to detect a position state of the display device; a camera unit configured to sense an image in a front direction; and a processor configured to: control the communication unit, the display unit, the sensor unit, and the camera unit; and execute the second content, the display device being configured such that if an arrangement state of the smart watch and the display device corresponds to a first state, the display device transmits the execution signal of the first content to the smart watch, and if the arrangement state of the smart watch and the display device corresponds to a second state, the display device does not transmit the execution signal of the first content to the smart watch and executes the first content on the display device, wherein the first content corresponds to a content relevant to the second content currently executed in the display device, wherein the arrangement state of the smart watch and the display device comprises the first state and the second state, and wherein the first state corresponds to a state that a display unit of the smart watch and the display unit of the display device face an identical direction and the second state corresponds to a state that the display unit of the smart watch and the display unit of the display device do not face an identical direction. a communication unit configured to receive a connection signal and a position state of a smart watch from the smart watch, and transmit an execution signal of a first content to the smart watch; a display unit configured to display a second content; a sensor unit configured to detect a position state of the display device; a camera unit configured to sense an image in a front direction; and a processor configured to: control the communication unit, the display unit, the sensor unit, and the camera unit; and execute the second content, the display device being configured such that if an arrangement state of the smart watch and the display device corresponds to a first state, the display device transmits the execution signal of the first content to the smart watch, and if the arrangement state of the smart watch and the display device corresponds to a second state, the display device does not transmit the execution signal of the first content to the smart watch and executes the first content on the display device, wherein the first content corresponds to a content relevant to the second content currently executed in the display device, wherein the arrangement state of the smart watch and the display device comprises the first state and the second state, and wherein the first state corresponds to a state that a display unit of the smart watch and the display unit of the display device face an identical direction and the second state corresponds to a state that the display unit of the smart watch and the display unit of the display device do not face an identical direction. control the communication unit, the display unit, the sensor unit, and the camera unit; and execute the second content, the display device being configured such that if an arrangement state of the smart watch and the display device corresponds to a first state, the display device transmits the execution signal of the first content to the smart watch, and if the arrangement state of the smart watch and the display device corresponds to a second state, the display device does not transmit the execution signal of the first content to the smart watch and executes the first content on the display device, wherein the first content corresponds to a content relevant to the second content currently executed in the display device, wherein the arrangement state of the smart watch and the display device comprises the first state and the second state, and wherein the first state corresponds to a state that a display unit of the smart watch and the display unit of the display device face an identical direction and the second state corresponds to a state that the display unit of the smart watch and the display unit of the display device do not face an identical direction.