NFC tag recognition device and NFC tag recognition system including the same

An NFC tag recognition device includes an antenna responsive to signals transmitted by an NFC tag, a radio frequency (RF) signal processor measuring power of the signal received by the antenna from the NFC tag and converting the signal into digital data, an NFC controller extracting an authentication key from the digital data, an authentication signal processor generating an authentication pattern from the NFC tag, and an authentication signal storage storing an authentication key and an authentication pattern of a registered user. The authentication signal processor generates an authorization grant signal if the extracted authentication key matches the stored authentication key and the generated authentication pattern matches the stored authentication pattern.