A microorganism contamination countermeasure selection device includes a gene information acquirer configured to acquire gene information indicating information on genes of microorganisms contained in a sample, an index determiner configured to determine at least one of microorganism indexes corresponding to the gene information acquired by the gene information acquirer based on the gene information acquired by the gene information acquirer 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, and a contamination countermeasure selector configured to select at least one of contamination countermeasures corresponding to the microorganism index determined by the index determiner based on the microorganism index determined by the index determiner 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.
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