A color simulation system includes: a base screen displaying section that displays a base screen having first through fifth layers; a first input section (6) that receives an input of choice indicating one of hair colors registered in a hair color data storage section (3); a second input section (7) that receives an input of choice indicating two hair color preparations selected from hair color preparations registered in a hair color preparation data storage section (4), together with a mixing ratio between the selected two hair color preparations; a first image displaying section (8) that displays a hair line image with predetermined transparency on the first layer; a second image displaying section (9) that displays the selected hair color without transparency on the fifth layer; a third image displaying section (10) that displays the colors of the selected two hair color preparations on the third and fourth layers, respectively, with the transparency corresponding to the selected mixing ratio; and a fourth image displaying section (11) that displays the selected hair color with predetermined transparency on the second layer.