Ultra-high resolution broadcasting such as 4K and 8K are becoming more popular for athome use. The position of the viewer's mean gaze point when they are looking at a larger display depends on the video clip, viewing position, and viewing distance. The International Telecommunication Union provided the document BT-2022; as the standard viewing conditions for the subjective evaluations of flat-panel TV displays. However, it is rare that a television is viewed at home under standard viewing conditions. In most homes, a TV of any size is watched from the viewer's desired position according to the layout size of the room hosting the TV. No study has been conducted to determine how the movement of a viewer's line of sight changes when a display with different resolution is viewed from a position different from the standard viewing condition. If the gaze position when viewing TV differs due to the difference in resolution, the size of the display, and the difference in observation position, it affects the method of TV production. This would also affect consumers considering the resolution, installation location, and viewing location of a TV. Here, we clarified that the mean gaze position and its standard deviation are almost the same viewing conditions (i.e., resolution, display size, and viewing position) are changed, even when the same contents are viewed. Our findings demonstrate that consumers could buy a display of their preferred resolution and size according to their room layout.