The color signal conversion apparatus and method, and a computer-readable recording medium storing a computer program for controlling the apparatus is disclosed. The first to the m input color for the input color signal having the components first to the n (where, n is greater than m.) The device for converting into an output color signal having the output color component, first to n-th output and combination extracting unit for extracting a combination of color component, using a combination of extraction and input color signal is selected by using the coefficients of the desired combination from among the input color signals extracted in combination with the coefficient generation unit for generating coefficient, expressed using the combination selecting unit, and the selected combination is characterized in that it comprises an output for generating an output color signal. Therefore, while using the color gamut and correctly express the input color signal without an error through the display device, having a display device as much as possible, the color components of a limited number of more number of the input color signal having a color component of the (m) (n) and these can be easily converted into an output color signal having, has an effect that does not cause disconnection of the available color representation occurs when adjacent color signal representation.