A microorganism contamination countermeasure selection method performed by a computer, the microorganism contamination countermeasure selection method comprising:
- a gene information acquisition step in which gene information indicating information on genes of microorganisms contained in a sample is acquired;
- an index determination step in which at least one of microorganism indexes corresponding to the gene information acquired in the gene information acquisition step is determined based on the gene information acquired in the gene information acquisition step and a microorganism index table in which a microorganism index based on features of the microorganisms is associated with at least one of the gene information;
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- a contamination countermeasure selection step in which at least one of contamination countermeasures corresponding to the microorganism index determined in the index determination step is selected based on the microorganism index determined in the index determination step and a contamination countermeasure table in which a contamination countermeasure against contamination by the microorganisms is associated with at least one of the microorganism indexes.