A network apparatus for performing a pairing with a user device, with the network apparatus already paired with a broker apparatus is disclosed, the network apparatus including a communicator including communication circuitry; a storage configured to store an RSSI value measured in the network apparatus and broker apparatus regarding a signal being exchanged with the broker apparatus with the broker apparatus at a close position; and a processor configured to determine whether the user device is close to the broker apparatus by as much as a predetermined distance based on each RSSI value measured in the network apparatus, broker apparatus, and user device regarding a signal being exchanged with the user device, an RSSI value measured regarding a signal being received from the broker apparatus, and a predetermined condition regarding a relationship between each RSSI value stored, and in response to determining that the user device is close to the broker apparatus by as much as the predetermined distance, to control the communication circuitry to perform an association for pairing with the user device.