Patent ID: 8242881

Claim:
A method of adjusting reference information for biometric authentication, comprising: storing the reference information including reference biometric data and threshold values corresponding to a plurality of users, respectively; obtaining biometric data of a user by inputting biometric information of the user; calculating a matching ratio of the biometric data with the reference biometric data of each of the users, respectively; comparing the matching ratio of each of the users with the threshold value of each of the users, respectively; determining which of the matching ratios exceed the corresponding threshold values; and increasing the threshold values which are exceeded by the corresponding matching ratios, respectively, on the basis of a comparison of a first threshold value of the user having the highest matching ratio with a second highest matching ratio when the determining indicates that at least two of the matching ratios exceed the corresponding threshold values and that a difference between the first threshold value and the second highest matching ratio is smaller than a predetermined value so that both the first threshold value and a second threshold value of the user having the second highest matching ratio become larger than the second highest matching ratio.