An information processing system includes a plurality of servers stored in a first rack; and a management server coupled to the plurality of servers and configured to: acquire consumed power values from the plurality of servers when power is supplied to the plurality of servers via first power supply lines coupled to a first power strip of the first rack, calculate the total of the consumed power values based on the values of power consumed by the plurality of servers, and switch a power supply of at least one servers among the plurality of servers so that power is supplied to the at least one server via a second power supply line coupled to a second power strip of a second rack when the total of the consumed power values exceeds a first threshold.