Energy-management device and energy-management system

An energy-management device (11) in this energy-management system (10) is provided with the following: an acquisition means (transmission/reception functionality) that acquires information on the load current being drawn by air-conditioning devices (41a through 41n) installed in a building and information on weather conditions in the region where said building is located; an external-heat-load calculation unit (11d) that uses the acquired weather-condition information to calculate the external heat load flowing into the building from outside; and an internal-heat-load estimation unit (11b) that uses the acquired load current to estimate an air-conditioning heat load, i.e. the heat load imposed by the air-conditioning devices (41a through 41n), and uses the difference between said air-conditioning heat load and the calculated external heat load to estimate an internal heat load excluding the air-conditioning heat load for the inside of the building (i.e., an indoor-unit heat load plus a human-body heat load).