A building-air-conditioning-equipment electrical-energy-consumption predicting apparatus that calculates the electrical energy consumption of building air-conditioning equipment during a prediction target period, comprising: a storage unit that stores actual operation data of the building air-conditioning equipment in association with the day, hour, and minute, the actual operation data including an electrical energy consumption, an outside air temperature, a room temperature, and temperature settings of individual air conditioners installed in a building, during a predetermined unit time and wherein said actual operation data is to be used for predicting the cumulative electrical energy consumption of the building air-conditioning equipment; a data specifying unit that specifies a part or an entirety of the actual operation data for a duration from a start time of the prediction target period to a current time; a data extracting unit that extracts the actual operation data specified by the data specifying unit from the storage unit; a statistical prediction unit that predicts the electrical energy consumptions during individual prediction target times in the prediction target period and after the current time by using time-series analysis on the basis of the actual operation data extracted by the data extracting unit; and an electrical-energy-consumption accumulating unit that calculates the predicted cumulative electrical energy consumption of the building air-conditioning equipment during the prediction target period by accumulating the electrical energy consumptions during the individual prediction target times predicted by the statistical prediction unit and the electrical energy consumptions which are included in the actual operation data stored in the storage unit for the duration from the start time of the prediction target period to the current time, wherein the electrical-energy-consumption accumulating unit repeatedly calculates the predicted cumulative electrical energy consumption during the prediction target period. a storage unit that stores actual operation data of the building air-conditioning equipment in association with the day, hour, and minute, the actual operation data including an electrical energy consumption, an outside air temperature, a room temperature, and temperature settings of individual air conditioners installed in a building, during a predetermined unit time and wherein said actual operation data is to be used for predicting the cumulative electrical energy consumption of the building air-conditioning equipment; a data specifying unit that specifies a part or an entirety of the actual operation data for a duration from a start time of the prediction target period to a current time; a data extracting unit that extracts the actual operation data specified by the data specifying unit from the storage unit; a statistical prediction unit that predicts the electrical energy consumptions during individual prediction target times in the prediction target period and after the current time by using time-series analysis on the basis of the actual operation data extracted by the data extracting unit; and an electrical-energy-consumption accumulating unit that calculates the predicted cumulative electrical energy consumption of the building air-conditioning equipment during the prediction target period by accumulating the electrical energy consumptions during the individual prediction target times predicted by the statistical prediction unit and the electrical energy consumptions which are included in the actual operation data stored in the storage unit for the duration from the start time of the prediction target period to the current time, wherein the electrical-energy-consumption accumulating unit repeatedly calculates the predicted cumulative electrical energy consumption during the prediction target period.