Energy management system, energy management method, and server device and terminal device that use energy management method

An energy management system for a facility having a plurality of pieces of equipment that consume energy, the energy management system being provided with: an equipment information storage device for storing equipment information pertaining to equipment utilization; an action history storage device for storing historical information on the actions of the equipment users; and a recommendation content decision means for calculating, on the basis of the equipment information and the action history information, actions pertaining to equipment utilization that will lead to a reduction in the amount of energy consumed at the facility, and deciding on recommendation content that includes actions for the users.