The repertoire of the variable region of T cell receptors (TCR) or B cell receptors (BCR) is quantitatively analyzed using non-biased gene sequence analysis. The present invention provides the following: a method for quantitatively analyzing the repertoire of the variable region of the T cell receptors (TCR) or B cell receptors (BCR) of a subject by using a database, wherein the method includes (1) a step for providing a nucleic acid sample containing the nucleic acid sequence of T cell receptors (TCR) or B cell receptors (BCR) amplified in a non-biased manner from the subject; (2) a step for determining the nucleic acid sequence contained in the nucleic acid sample; and (3) a step for calculating the frequency of appearance of each gene or combination thereof on the basis of the determined nucleic acid sequence and deriving the TCR or BCR repertoire of the subject.