Abstract: Provided is a constitutional disease pattern determination apparatus including a calculator to calculate a first deficiency and excess index and a first cold and heat condition index of a user based on clinical information on the user, and a determiner to determine, based on a first reference table corresponding to a first constitution, a first constitutional disease pattern corresponding to the first deficiency and excess index and the first cold and heat condition index among a plurality of constitutional disease patterns included in the first reference table, wherein the first constitution is a constitution classified to correspond to the user based on a Sasang constitution.