1. A computer system including a predetermined operating system, comprising: a language information-providing section adapted to store and generate language information about the kind of first language used in said operating system; an on screen display (OSD) generating section generating an OSD for setting a display environment of a display device; a memory storing a plurality of second languages used in said OSD; and an OSD control section controlling said OSD generating section to display said OSD on a display section of said display device in one of said first and second languages.