PURPOSE: To obtain a system for evaluating current illumination environment easily for general user as well as specialist based on preferable appearance of color, i.e., color rendering properties, and for evaluating color rendering properties based on the appearance of color preferable for configuring a more comfortable illumination environment for each use.

CONSTITUTION: The color rendering properties evaluation system comprises an average color rendering evaluation value Ra input section 1, a section 2 for operating Flattery Index of Judd or Jerome from the relationship between Judd or Jerome and Flattery Index, and a section 3 for outputting Flattery Index of Judd or Jerome thus operated.