1. A color-scheme determination device comprising: an input unit which receives designation of an evaluation target screen by a user; a color-scheme information acquisition unit which acquires color-scheme information including data regarding all colors used for information displayed on the evaluation target screen; an attractiveness calculation unit which calculates an attractiveness, representing the degree of attracting visual attention, in regard to each of the used colors by using the color-scheme information; an importance degree storage unit which holds importance degree information representing a relative degree of importance of each of the used colors and corresponding to the information for which each of the used colors is used; a color-scheme appropriateness judgment unit which calculates ordinal rank of the importance degree associated with each of the used colors based on the magnitude of the importance degree information, calculates ordinal rank of the attractiveness associated with each of the used colors based on the magnitude of the attractiveness, and outputs a judgment result indicating whether or not the ordinal rank of the importance degree associated with each of the used colors coincides with the ordinal rank of the attractiveness associated with the used color; and an output unit which displays the judgment result.