In the present invention, a biometric image capturing the biometrics of a user is acquired, the orientation of the biometrics in the biometric image is detected on the basis of the acquired biometric image, a template pattern is extracted that matches the orientation detected from a template pattern storage unit in which a plurality of template patterns are stored, feature information from the acquired biometric image is converted to the extracted biometric pattern, and the converted biometric pattern and the extracted template pattern are compared to authenticate the user, whereby correct biometric authentication can be performed even when the orientation of a hand being held up and the orientation of the imaging device differ between the time of registration and the time of authentication of vein data.
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