1. A color-scheme determination device comprising at least one processor configured to control the device to: receive designation of an evaluation target screen by a user; acquire color-scheme information including data regarding all colors used for information displayed on the evaluation target screen; calculate an attractiveness, representing the degree of attracting visual attention, in regard to each of the used colors by using the color-scheme information; hold 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; calculate ordinal rank of the importance degree associated with each of the used colors based on the magnitude of the importance degree information, calculate ordinal rank of the attractiveness associated with each of the used colors based on the magnitude of the attractiveness, and output 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 display the judgment result.