COMPUTER SYSTEM

PROBLEM TO BE SOLVED: To provide a computer system that provides a reproduced image with high image quality without deteriorating image quality due to an encoder at DVD reproduction, in the computer system provided with the encoder that outputs a DVD reproduction image onto a television receiver. SOLUTION: A selector 13 receives a digital RGB signal outputted from a graphic controller and an RGB signal via a scaling circuit 11 and a flicker filter 12 and selects either of them according to a control signal S and gives the selected signal to a format conversion circuit 14. The selector 13 selects the RGB signal outputted from the graphic controller and gives it to the format conversion circuit 14 when a reproduced image of a DVD is outputted to the television receiver in the full screen mode.