A combination of conference rooms to raise cost performance of office investment was studied. Many large rooms make reservation easy; however, do not use space efficiently. Smaller capacity as well as room number needs less space; however, make reservation difficult, which may result in a loss of business opportunity and a waste of workers' paid time. It was made clear that the balance of space efficiency and reserving convenience can be realized by analyzing the number of attendants and the frequency distribution of conference room needs of each planning capacity.
