A control method includes the electric lock entering an administrator setting mode after receiving an administrator password; the electric lock generating an authentication code in the administrator setting mode; the electric lock wirelessly receiving a first input from a portable device; the electric lock comparing the first input with the authentication code; the electric lock pairing with the portable device and receiving unique identification information of the portable device when the electric lock determines that the first input matches the authentication code; the electric lock storing the unique identification information of the portable device; and the electric lock performing an unlocking operation when the electric lock receiving a second input and sensing the portable device having the unique identification information within a predetermined distance.