Abstract: A video signal display control method and apparatus provide the display control functions for LCD-type or other similar display devices to be attached as output display units to an external microcomputer or other control systems that provide output video signals. The display controller contains computer program codes for processing the output video signals and permitting video signal information to be presented on a scaled-up size, on a scaled-down size, or as a partially extracted information on the physical screen of the display devices. The limitations on the performance of the external microcomputer imposed by the inherent performance of the display devices have thus been eliminated, allowing for the optimum use of the microcomputer performance.