Patent ID: 7051289

Claim:
A window display device which displays image data on a display screen, comprising: a first sub-screen displaying a first area of image data; a main screen displaying a part of said first area of image data with enlargement; a second sub-screen displaying a second area of image data which is adjacent to said first area of image data; a first sub-screen image window for displaying an area of image data displayed in said main screen with a display indicating frame on said first sub-screen; said display indicating frame being moved within said first sub-screen, said movement being caused by movement of a pointing device while said pointing device is in a dragging state, said movement of said display indicating frame being effected due to the sub-screen window; said first sub-screen window notifying a main screen image window of said movement of said pointing device; said main screen image window receiving said notification from said first sub-screen window; said main screen image window moving said image data within said main screen in correspondence to the received notification; and a second sub-screen image window for displaying said display indicating frame in said second sub-screen when said pointing device has moved said display indicating frame by dragging it into said second sub-screen.