A method for estimating load by energy meter including aload estimation model based on a neural network is provided. Themethod includes steps of: (a) the energy meter generating sampledsupply electric power information by sampling information onelectric power based on a predetermined sampling rate; (b) theenergy meter instructing the load estimation model to output loadinformation; and (c) the energy meter (i) transmitting the loadinformation and information on an amount of the electric energyto a data management server and (ii) instructing the datamanagement server to monitor the information on the amount ofthe electric energy, information on each sub-electric power foreach of the loads, and information on each sub-amount of theelectric energy for each of the loads.