The invention relates to a triple-deck elevator equipment planning support system, arranged such that the average number of times of being stopped per going-round is calculated on the basis of a given building specification and cage specification data in a triple-deck elevator system; a total value of getting-on/off time periods of passengers, a total value of door-opening/closing time periods, and the total value of running time periods are calculated based on the average number; and a going-round time period of an elevator is calculated from these calculation results, and a practical transportation capacity per on triple-deck elevator is calculated.