1. A device for distributing a load and managing power, comprising: a monitoring unit configured to monitor a load distribution condition on server nodes included in a server cluster and a dynamic state of each of the server nodes; a server node information storage unit configured to store static state information of each of the server nodes; a policy determination unit configured to determine a load distribution policy and a power management policy for each of the server nodes using information monitored by the monitoring unit and the static state information stored in the server node information storage unit; and a controller configured to control conversion of the server nodes into an active state or an inactive state according to the power management policy, and distribution of a load of a service request requested by a service client to activated server nodes according to the load distribution policy.