Patent ID: 7307647

Claim:
A computer system having a central processing unit (CPU), and a display apparatus coupled to the CPU, the computer system comprising: an input section operable to present a zoom factor to a user, the zoom factor specifying a pre-determined magnification amount for zooming in on an image displayed on a display screen of the display apparatus and being a number equal to a first resolution of the display apparatus divided by a second resolution of the display apparatus, the input section further operable to receive user input selecting the zoom factor; a resolution changing unit operable to zoom in on the image displayed on the display screen in accordance with the pre-determined magnification amount by changing a resolution of the display apparatus from the first resolution to the second resolution in response to the user input selecting the zoom factor, wherein the image is displayed within an active window and the resolution changing unit is operable to zoom in on the image displayed on the display screen by resizing the active window, and wherein a size of an inactive window being displayed on the display screen remains unchanged irrespective of the resolution change of the display apparatus from the first resolution to the second resolution; and a display status restoring unit operable to hold a first display status of the image displayed on the display screen before the resolution of the display apparatus is changed to the second resolution by the resolution changing unit, the display status restoring unit further operable to restore the image displayed on the display screen to the first display status when the resolution of the display apparatus is restored to the first resolution.