UNLOCKING SYSTEM, CONTROL METHOD FOR SAID UNLOCKING SYSTEM, CONTROL DEVICE, AND CONTROL METHOD FOR SAID CONTROL DEVICE

There is provided an unlocking system capable of improving convenience of a user.An unlocking system 100 includes: a DK acquisition unit 30a that acquires strength information RI on strength of radio waves of a wireless signal received by receiving antennas 20a to 20e; and a DK execution unit 30b and an unlocking execution unit 40b that execute a shielded state determining process Sa, a region determining process Sb, and an unlocking control process Sc as an unlocking process of controlling release of a lock 21, the DK execution unit 30b acquires shielding information SI on a shielded state of a wireless terminal 10 based on the strength information RI in the shielded state determining process Sa, and corrects the strength information RI by using the shielding information SI in the region determining process Sb, and the unlocking execution unit 40b executes control for releasing the lock 21 based on region information ZI acquired based on the corrected strength information RI in the unlocking control process Sc.