It is requested to promote technology development and productivity that is way to conquer the competition of technology and quality and pressure of cost caused by a rise in prices. To pace up the market fluctution and the deepening of competion, there need a strategical thoughts of production management. Corporation's efforts concentrated in specific business field are desired to insure the initiative competion. In this paper, the concentration aimed at gaining higher competion is analized in the condition of equal enviornment and/or situation