An information processing method to be executed by a processor, the processing method includes setting an area target amount of reduction in power consumption of a target area; acquiring a predicted value and a measured value of outdoor temperature at each of a plurality of subareas included in the target area; calculating, for each of the plurality of subareas, a prediction error of outdoor temperature by calculating a difference between the predicted value and the measured value; calculating, for each of the plurality of subareas, a utilization rate indicating a rate of assignment of the area target amount of reduction in power consumption by solving an objective function generated based on the area target amount of reduction and a variance of the prediction error of outdoor temperature; and determining, for each of the plurality of subareas, a subarea target amount of reduction in power consumption based on the utilization rate.