Collaborative Learning, a teaching method of asking groups of learners to do tasks collaboratively attracts attention for its effectiveness of acquiring various skills. Recognizing the limit of current design of personal computer (PC) for collaborative use in face-to-face environment, this paper proposes a computer system called Socialized Computer (SC) as an extension of or alternative to PC. The SC allows multiple users access to the computer with multiple mice and keyboards, and share information on a single large display. In this paper, the authors introduce the concepts of the SC, give overview of the related works, discusses implementation issues. Further, three application developed along the concept of the SC and results of experiments using them are also shown.