The embodiment of the invention provides an energy management system and an energy management method, and relates to the technical field of computers. The system comprises a controller, at least one piece of controlled equipment and at least one router, wherein the controller comprises a data collection module, and each router builds communication connection with the at least one piece of controlled equipment; the data collection module sends a historical energy consumption data request to the router and receives energy consumption data sent by the router, when receiving an energy consumptiondata command from a user and the needed acquired energy consumption data is cleared, the controlled equipment receives a real-time energy consumption data request forwarded by the router, and sends the energy consumption data to the router; and the router receives the historical energy consumption data request sent by the data collection module, and sends the found energy consumption data to the data collection module. With the application of the scheme provided by the embodiment of the invention, the transmission path of the energy consumption data can be shortened, and thus the transmissiontime is shortened, and the transmission efficiency of the system network and the response speed of the system are enhanced.