A user of a colored paint is made to have an inexpensive color matching device having the least measuring and mixing functions, and a maker of a colored paint offers the user a base paint, a thinned pigment dispersion for rough color matching and a thinned pigment dispersion for fine color matching and a data indicating mixing amounts of them in terms of a unit which is easy to calculate, and further offers him a correction data of mixing amounts in consideration of seasonal factors or environmental factors as required.