A liquid chromatography mass spectrometer, the mass spectral data obtained from a sample of each of the comparison sample and reference sample, the present invention is to be able to easily recognize the similarity of the comparison sample and reference sample, It was not to display the unwanted peak, so that you can accurately recognize the results of the analysis of the individual. Therefore, on the map that was centered on mass-to-charge ratio and retention time, and is shown by shading the ion peak intensities of mass spectral data, mass spectra data obtained from a sample of each of the comparison sample and reference sample. In addition, also be provided map with is displayed differently only other peak intensities specified, to display only the peak.
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