1. A color selecting method comprising: a generating step of generating image data used for printing a color chart having a plurality of color patches with a printing machine, color values and positions of the color patches being associated with each other; a displaying step of displaying an image simulating the positions of the color patches on the color chart; an indicating step of indicating, on the displayed image, a coordinate corresponding to the position of a color that has been selected as a color that is closest to a designated color, from the color patches of the color chart; and a calculating step of calculating color a value of the color that is closest to the designated color based on the color values and positions that are associated with each other and the indicated coordinate.