Access management system and access management method

An access control method of an access control device that authenticates user terminal access using an advertising packet, the access control method comprising:

• broadcasting the advertising packet to a plurality of user terminals in a predetermined range, wherein the advertising packet includes a first public key and an identification information of the access control device;
• receiving a first packet from a first user terminal of the plurality of user terminals, wherein the first packet includes variable information encrypted based on the first public key, wherein the variable information includes open authentication information corresponding to the access control device, wherein the first user terminal pre-stores the open authentication information corresponding to the access control device;
• loading a first private key corresponding to the first public key;
• decrypting the encrypted variable information based on the first private key to obtain the open authentication information;
• determining whether to open a door or not based on the open authentication information;
• and
• transmitting, from the access control device to an electronic component associated with the door, a signal indicative of the determination whether to open the door or not,
• wherein the identification information of the access control device in the advertising packet is used for a generating of the encrypted variable information in the first user terminal such that it is confirmed that the encrypted variable information is generated by the first user terminal that has received the advertising packet.