An information processing device configured to obtain an index with regard to light entering a measurement target region in a wider range is disclosed. The information processing device calculates, on a basis of a measured value of a reference reflection region, a reference index including a sunny place reference index and a shady place reference index, and calculates, on a basis of a measured value of a measurement target region obtained by performing sensing for the measurement target region and the reference index, a measurement target region index including a sunny measurement target region index being an index with regard to light entering a sunny region in the measurement target region and a shady measurement target region index being an index with regard to light entering a shady region in the measurement target region.