To easily and exactly identify the species of organisms classified on the basis of biological taxonomy, even without using huge retrieval tables.

This identification system for identifying biological species classified, on the basis of biological taxonomy, has a species information storage part 8 for storing the information of species classified on the basis of biological taxonomy, a feature retrieval part 11 for retrieving the species information stored in the species information storage pat 8, on the basis of the features of an organism as a retrieval target, a name retrieval part 12 for retrieving the species information stored in the species information storage part 8 on the basis of the name, such as Japanese nomenclature or scientific nomenclature of the organism as a retrieval target, a taxon retrieval part 13 for retrieving the species information store in the species information storage part 8 on the basis of the taxon such as order, family and genus of the organisms as a retrieval target, and a composite retrieval part 14 for compositely operating these three retrieval means.