The marker peak can be selected easily.Multiple microorganismsA theoretical mass obtaining section 111 for obtaining a theoretical mass for the plurality of proteins contained in the microorganism andAn actual data acquisition section 114 for obtaining the results of mass spectrometry of each microorganism andA theoretical mass table preparation part 112, which creates a theoretical mass table in which the microbial names and protein names are arranged in the vertical and transverse directions, and the theoretical mass corresponding to each cell is assigned, andA marker candidate protein selector 121, which selects a protein with a difference in theoretical mass by a microorganism as marker candidate protein, andFrom the actual data on the plurality of microorganismsA reference spectral generator 115 for generating a mass spectrum of a predetermined mass range including a theoretical mass of marker candidate proteins in each microbe andA theoretical mass table and a display 116 for displaying the mass spectrumA theoretical mass table display system having 122.Diagram
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