Method for providing application menu in image display device, and image display device using same

A digital television comprising:

• a tuner configured to receive a broadcast signal carrying a broadcast program;
• a decoder configured to decode the received broadcast signal into a broadcast program;
• a user interface input/output circuitry configured to receive via user interface a first control signal requesting to display a first an application list including a plurality of application items and a second control signal selecting an application item from the application list;
• a network interface, different from the tuner, configured to receive a first application image corresponding to the first application item, a second application corresponding to a second application item, and a third application image corresponding to a third application item via a network interface different from the tuner, the first through third application images comprising a screenshot image and a video obtained from execution of the first, second, and third application items;
• a controller processor configured to:
• generate for display the decoded broadcast program on a first window and first application image on a second window in on a display screen,;
• generate for display the first application list with the broadcast program and the first application image in on the display screen in response to the received first control signal,;
• and
• generate for display a second the first application image corresponding to a selected first application item on the a second window in on the display screen to replace the displayed first application image with the first window in response to a second control signal selecting the first application item from the displayed first application list via the user interface;
• and
• a display,
• wherein the user interface further receives a third control signal requesting to display a second application list including a plurality of application items and receiving a fourth control signal selecting an application item from the second application list,
• wherein the controller is further configured to switch the first application list into the second application list in the display screen in response to the received third control signal and display a third application image corresponding to the selected application item on the second window in the display screen to replace the displayed second application image in response to the received fourth control signal,
• wherein the first through third application images are an image, including a screenshot image and video, obtained from execution of the first through third applications and are received via a network interface which is different from the tuner, and
• wherein the controller is further configured to continuously display the broadcast program on the first window regardless of changing any application images on the second window.