An energy management controller acquires, for each of power lines in a demand area, from devices, measurement data relating to a power value measured by each device. The energy management controller selects, when power values are measured from a single power line, one power value as a power value measured from the power line, based on a priority assigned beforehand to each device. Then, the energy management controller manages power consumed in the demand area using the power value measured from each power line. Furthermore, the energy management controller causes an operation terminal to display, in a predetermined mode, information indicating the power value measured from each power line.