There is provided a method of designing a probe from a polynucleotide group comprising a plurality of polynucleotides, the method including: forming a polynucleotide group by selecting polynucleotides having a certain sequence; producing polynucleotide fragments having a certain length from each of the polynucleotides of the polynucleotide group and obtaining sequence and position information on the polynucleotide fragments; providing each polynucleotide fragment with a sequence specific identification number using the obtained sequence and position information of the polynucleotide fragments; and comparing the identification numbers of the fragments to select the probe.