1. A print color predicting method for predicting colors of a print produced by a printing press, comprising the steps of: generating a standard color chart with the printing press, which is set to standard density conditions, for producing the print of standard densities; measuring said standard color chart to determine standard measured values; generating variation color charts, in which the density of each of inks used to generate said print is independently varied by a given amount, and the densities of inks other than the varied ink are secured to said standard density conditions; measuring said variation color charts to determine varied measured values; when said inks are set to desired density variations from said standard densities, adjusting said standard measured values using differences between said standard measured values and said varied measured values with respect to said inks set to said desired density variations; and predicting the colors of said print set to said density variations based on the relationship between data for generating said standard color chart and the adjusted standard measured values.