The purpose of the present invention is to provide a beauty level estimation system and a beauty level estimation method for calculating the beauty level of a pet raised by a user, on the basis of a correlation between diversity data related to diversity of the intestinal flora of an animal and a beauty level. This beauty level estimation system includes: an acquisition unit for acquiring diversity data on the intestinal flora of a pet raised by a user; and a calculation unit for calculating the beauty level of the pet raised by the user on the basis of the diversity data on the intestinal flora and a correlation between the diversity data on the intestinal flora of the pet and the beauty level.

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