1. A method of analyzing overlapping peaks on a multi-channel chromatogram, comprising the steps of: deconvoluting said multi-channel chromatogram using a predetermined dispersion function; multivariate-analyzing the deconvoluted multi-channel chromatogram; determining whether multivariate analysis corresponding to the width of said predetermined dispersion function uniquely has a solution; adjusting the width of said dispersion function by a subtraction operation subtracting a standard deviation from said width of said dispersion function until the multivariate analysis uniquely has a solution; and determining a multi-channel chromaogram deconvoluted by using a dispersion function adjusted by said subtraction operation.