KEY MANAGEMENT METHOD AND SYSTEM USING SMARTPHONE

The present invention relates to a key management method and a system using a smartphone which use a smartphone or a computer, and let a user reserve the taking out or bringing in of a key of a key box in advance, and pass through an authentication process using the smartphone or a staff ID to take out and bring in the key. The method of the present invention comprises: a step of reserving the taking out or bringing in of the key, wherein a smartphone (10) accesses a key management server (20) and registers an NFC tag value of the smartphone (10), user information including an image of the user, the number of the key to be taken out, purpose of use, and time for reservation; a step of transmitting an authentication number, wherein the key management server (20) receives an authentication for taking out the key of the user from a manager terminal (30) and transmits the authentication number to the smartphone (10); a step of acquiring user information, wherein the key box (40) acquires the ...