Patent ID: 8843830

Claim:
A mobile terminal, the mobile terminal comprising: a camera configured to obtain an image including a screen displayed by an external display device; an internal display device in communication with the camera, configured to display the obtained image to a user; a user input device in communication with the internal display device, configured to receive touch information on the internal display device from the user; a screen-detecting device in communication with the camera, configured to detect angular points of the screen in the obtained image; a screen control device in communication with the screen-detecting device, configured to adjust a length/width of the screen on the internal display device and a degree of rotation of the screen based on the detected angular points such that the screen is displayed through the whole internal display device; and a transmission device in communication with the screen control device and the user input device, configured to transmit screen display information about how the screen is displayed on the internal display device and the touch information to a broadcast receiving terminal connected to the external display device, wherein the touch information includes selection information of a first point on the internal display device and movement direction information of the first point when the first point moves, wherein the screen display information includes length/width information of the internal display device and location information of angular points of the screen on the internal display device, and wherein the selection information of the first point includes location information of the first point on the internal display device.