Display screen control method

Claim 1

A display screen control method for facilitating the selection of display data in a display device capable of supporting a logical screen larger in size than a physical screen on which information of the logical screen is to be displayed, said method comprising the steps of: displaying on the physical screen a first window area which is within the logical screen; changing the display on the physical screen to a first rectangle related to the size of said logical screen in response to a command inputted by an operator, and displaying in the first rectangle displayed on the physical screen a second rectangle similar to said first window area which is within the logical screen and which was previously displayed on the physical screen just before displaying the first rectangle, the second rectangle being displayed in the first rectangle at a position corresponding to a position of the first window area in the logical screen; moving the second rectangle to a desired position within said first rectangle so as to determine a second window area which is within the logical screen and which is desired to be picked up from the logical screen and to be displayed on the physical screen; and changing the display on the physical screen to the second window area determined by the second rectangle moved to the desired position in the first rectangle in response to another command inputted by the operator.