According to one embodiment, a method is disclosed for evaluating discomfort glare. The method can include obtaining average luminance information relating to an average luminance La of a luminous surface of a luminaire, luminance uniformity ratio information relating to a luminance uniformity ratio U of the luminous surface, luminous surface size information relating to a size ω of the luminous surface, and background luminance information relating to a background luminance Lb of the luminaire. The method can include calculating an evaluation parameter value based on the La, the U, the ω, and the Lb obtained in the obtaining. The evaluation parameter value is a value of a product of a value based on the La, a value based on the U, and a value based on the ω divided by a value based on the Lb.