1. A color processing method, performed by a color processing apparatus including a processing unit, for mapping one or more input colors in a first color gamut into a second color gamut, the color processing method comprising: determining, by the processing unit, representative colors based on the input color; setting, by the processing unit, a reference lightness range based on lightness of the determined representative colors and a hue of the input color in the first color gamut; setting, by the processing unit, a first distribution range for a mapped point based on maximum lightness of the second color gamut and an upper point of the reference lightness range, a second distribution range for the mapped point based on the reference lightness range, and a third distribution range for the mapped point based on minimum lightness of the second color gamut and a lower point of the reference lightness range; setting, by the processing unit the mapped point based on the lightness of the input color and each of the set distribution ranges; and mapping, by the processing unit, the input color into the second color gamut using a line connecting the mapped point and the input color, wherein, when the lightness of the input color is higher than the upper point, the mapped point is distributed in the first distribution range, when the lightness of the input color is inside the reference lightness range, the mapped point is distributed in the second distribution range such that the input color to be mapped is distributed in the second distribution range such that the input color to be mapped is mapped with lightness kept constant, and when the lightness of the input color is lower than the lower point, the mapped point is distributed in the third distribution range.