1. A method for an optical fingerprint recognition, the method comprising: scanning a fingerprint image separately using a multiple exposure which allows alternating a short exposure and a normal exposure; determining whether there is an inflow of external light depending on a darkness level of a fingerprint image derived from the normal exposure among a plurality of scanned finger print images; and performing a fingerprint recognition using at least one of the scanned fingerprint images derived from the short exposure or the fingerprint image derived from the normal exposure in accordance with the determination result as to the inflow of external light; wherein said performing a fingerprint recognition comprises: straightly applying the fingerprint image derived from the short exposure to the fingerprint recognition.