A control method, suitable for a host device including a Bluetooth low energy communication circuit, includes following operations. A high priority list is obtained. The high priority list includes information about at least one first peripheral device. The BLE communication circuit is triggered to perform a first scan to search for any peripheral device around the host device. A first search result of the first scan is compared with the high priority list. In response to that the first search result covers all of the at least one first peripheral device in the high priority list, the BLE communication circuit is triggered to stop the first scan. The BLE communication circuit is triggered to communicate with the at least one first peripheral device found in the first scan.