An energy management apparatus according to an embodiment of the present invention is designed to provide a method for visually displaying an energy operation status in various manners so as to facilitate energy analysis, and may comprise: a measurement unit for acquiring power state information of at least one energy apparatus constituting a system to which the energy management apparatus belongs; a control unit for analyzing an energy operation status on the basis of the acquired power state information; and a display unit for displaying the analyzed energy operation status in the form of a three-dimensional energy graph, wherein each of the X-, Y-, and Z-axes of the three-dimensional energy graph is mapped to one of time, an energy apparatus, and an object of energy analysis.