The present invention relates to a method for classifying genotype or subtype of query sequence. More particularly, the present invention is directed to a method for classifying genotype or subtype of query sequence, comprising: (i) selecting base sequences of various viruses of which genotypes or subtypes are known as reference sequences and obtaining a distance matrix by calculating distances between sequences in a multiple alignment of said reference sequences; and (ii) developing a discriminant equation which may classify the reference sequences by performing discriminant analysis for a cluster obtained by clustering said reference sequences through multidimensional scaling of the distance matrix, followed by classifying genotype or subtype of a query sequence according to said discriminant equation.