A system of the present invention includes: a storage unit configured to store the value of consumed energy of an information processing device configured to be supplied with power by a power supply device and a power storage device charged by the power supply device; and a calculation unit configured to calculate a power supply device upper limit value set as the upper limit value of a value representing a characteristic of energy supplied from the power supply device to the information processing device. The calculation unit is configured to calculate the power supply device upper limit value on the basis of the consumed energy in a predetermined period.