A method for sharing data with a mobile terminal in an image display device, can include including receiving a broadcast signal including audio and video data, connecting to the mobile terminal via a wireless network interface, controlling the wireless network interface to transmit data to the mobile terminal wirelessly connected to the image display device, in which the transmitted data includes information for representing a screen posture direction of the image display device, controlling the wireless network interface to receive screen information from the mobile terminal wirelessly connected to the image display device, in which the screen information changes based on the information for representing the screen posture direction of the image display device and displaying a mirroring image based on the screen information received from the mobile terminal in a first region while displaying the video data included in the broadcast signal in a second region, in which the mirroring image corresponds to a current screen displayed on the mobile terminal, further the video data is received via a tuner while the screen information is received via the wireless network interface different from the tuner.