An image display device including a display; a first external interface configured to receive a first image signal input from a first external device connected to the image display device; a second external interface configured to receive a second image signal input from a second external device connected to the image display device; and a controller coupled with the display, the first external interface and the second external interface. The controller is configured to display a plurality of external device icons on the display, wherein the plurality of external device icons include a first external device icon corresponding to the first external device and a second external device icon corresponding the second external device, wherein a first default image is displayed on the first external device icon and a second default image is displayed on the second external device icon, display the first default image if the first external device is not connected to the image display device, change the first default image to a first image based on the first image signal in response to the first external device icon being selected if the first external device is connected to the image display device, display the second default image if the second external device is not connected to the image display device, and change the second default image to a second image based on the second image signal in response to the second external device icon being selected if the second external device is connected to the image display device.