In a smart energy management system linked with home network devices respectively installed in a plurality of households to manage the use of energy for each household, a location detecting unit detects location information or entry/exit information of a household member through recognition of an RFID tag carried by the household member connected with an RFID receiving device. An energy recording unit receives energy use details of the household, inputted from the home network device, and records the received energy use details together with the location information or entry/exit information of the household member. A pattern analysis unit analyzes an energy use pattern for the energy use details. An energy management unit provides the energy use details through the home network device as a result obtained by comparing the energy use detailed for each household or so that the household member recognizes the energy use pattern.