1. A method of analyzing a specimen cell sample in an automatic analyzing apparatus comprising the steps of: providing a measurement cell sample and a specimen cell sample; measuring, by said automatic analyzing apparatus, attributes of individual cell objects of said measurement cell sample and said specimen cell sample and selecting a plurality of said cell objects from said measurement cell sample and said specimen cell sample; comparing by said automatic analyzing apparatus said measured attributes to predetermined parameters distinctive of said cell objects; determining a thickness of the measurement cell sample from a distribution of said cell objects of said measurement cell sample; utilizing the determined thickness of said measurement cell sample in analyzing said specimen cell sample by said automatic analyzing apparatus; and identifying ones of said cell objects which are to have their DNA mass values corrected and correcting the DNA mass value of said identified ones of said cell objects by an amount computed from said determined thickness of said measured cell sample.