Video display device, terminal device, and method thereof

1. A first display device, comprising:

a display unit;

a camera;

a microphone;

a first communication unit communicating with an internet protocol based (IP-based) network;

a second communication unit communicating with a second display device; and

a controller, in the first display device,

capturing audio-visual content, through the camera or the microphone,

extracting characteristic information from watermark information embedded to the captured audio-visual content,

acquiring contents information of the audio-visual content including an address of a first server, based on the characteristic information,

acquiring an address of an available enhanced service based on the contents information from the first server,

displaying a user interface for selecting enhanced service type,

receiving a control input via the user interface for controlling the available enhanced service,

transmitting a request including the received input for the available enhanced service,

receiving a response corresponding to the request,

outputting the available enhanced service based on the response, wherein the enhanced service type is one of a control function transfer type or an enhanced service transfer type,

wherein the received input indicates a request to transfer a control function of the available enhanced service that is being outputted on the second display device,

wherein the second display device terminates the control function of the available enhanced service corresponding to the request but maintains an output function of the available enhanced service,

wherein the response includes state information on the available enhanced service and

wherein the controller receives a message representing control function transfer conflict, when a maximum number of terminal devices to which the control function can be transferred is equal to a number of terminal devices to which the control function has been transferred and outputs a user interface for inquiring whether to maintain or terminate the control function of enhanced service.

2. The first display device of claim 1 , wherein the controller transmits a message for requesting an available enhanced service alarm, receives a first response based on the requesting message from the second display device and outputs a user interface indicating that the available enhanced service can execute, based on the first response.

3. The first display device of claim 2 , wherein the first response includes at least one of an identifier of the available enhanced service and an executing time of the available enhanced service.

4. The first display device of claim 1 , wherein the control input corresponds to a menu for executing a specific application in the first display device.

5. The first display device of claim 1 , wherein the camera or microphone receives a second response from the second display device, when the second display device fails to acquire the available enhanced service, and transmits a message based on the received second response.

6. The first display device of claim 1 , wherein the controller outputs a user interface window for authentication, and

wherein the authentication user interface window comprises a first user interface for inputting a user type for determining a range of usage authorization of the enhanced service, and a second user interface for inputting a password of the first display device,

wherein the user type is either a first type or a second type.

7. The first display device of claim 6 , wherein when the user type is the first type, the first display device assigns only a view authorization to the paired second display device.

8. The first display device of claim 6 , wherein when the user type is the second type, the first display device assigns not only the view authorization but a controlling authorization.

9. The first display device of claim 1 , wherein the controller transmits a query for checking activation of function of automatic content recognition and receives a third response corresponding to the query.

10. The first display device of claim 9 , wherein the controller outputs a third user interface for controlling the automatic content recognition based on the third response.