To easily and accurately perform calibration with respect to environment light. In one example, an information processing device includes a memory configured to store detected values of illuminances of environment light; and a color temperature estimation unit configured to estimate a color temperature of the environment light, on a basis of detected values of illuminances of the environment light within a plurality of wavelength bands. The disclosed technology can, for example, be applied to a system that performs remote sensing on an agricultural land, and calculates an evaluation index such as a normalized difference vegetation index (NDVI).