A power supply distribution system including a power supply for supplying electric power; power outlets to which electronic devices are connected; power detection circuits for measuring an amount of electric power used through each of the power outlets; a power amount arithmetic circuit for determining a supply amount of the electric power to the power outlets based on information from the power detection circuits; and power limiting circuits for limiting the supply amount of the electric power to the power outlets. The power amount arithmetic circuit calculates a threshold of the amount of electric power used to be supplied to each of the power outlets based on a maximum supply amount of the electric power from the power supply and a number of the power outlets; and limits the amount of electric power used to be supplied to some power outlets to not more than the threshold.