PROBLEM TO BE SOLVED : To obtain a company type investment trust system capable of collecting funds from many investors without violating any current trading rules, increasing investment profits by utilizing loans and executing the profitable investment/disposition of invested real estate.SOLUTION : A specific target company 5 purchases real estate 7 and makes profits based on the real estate 7. Respective security investment corporations 3A, 3B accept a specific corporate bond 9 or a priority investment 11 issued from the company 5 and invest money. Profits obtained by the company 5 are restored to these corporations 3A, 3B as specific corporate bond interests 13 or priority investment shares 15. An investor 1 invests money to the corporations 3A, 3B. A dividend based on the profits obtained by the corporations 3A, 3B is restored to the investor 1.