Abstract: The content provides a smart door system and identification system. The identification system includes a Bluetooth low energy (BLE) signal broadcasting apparatus, a signal processing apparatus, a wireless signal receiving apparatus and a server. The signal processing apparatus receives a BLE signal broadcasted by the BLE signal broadcasting apparatus and transmits identification information to the wireless signal receiving apparatus by wireless communication. The server stores verification information and determines what the signal processing apparatus represents in accordance with a relationship between the verification information and the identification information received from the wireless signal receiving apparatus.