This invention provides a server system in which a plurality of servers are divided into a plurality of groups in accordance with a physical arrangement. The server system includes at least one system power provider that distributes and provides system power to each of the plurality of groups, a battery that corresponds to each of the plurality of groups and provides stored power to at least two servers included in the group, and a controller that controls each of the servers included in one group based on power providable by the system power provider and the battery.