A method and apparatus for estimating the relative height of a stutter peak in an individual typing experiment and a pooled typing experiment which is conducted on a DNA marker with high accuracy without performing an additional preliminary experiment, and displaying the result of the experiment or the like that has been corrected in accordance with the results of estimation. A determination as to whether or not a DNA marker is a compound marker and the estimation of the relative height of a stutter peak are made by utilizing the intervals of peaks in a waveform of a detection signal obtained from a PCR amplification product and the features of published genome sequences.