In this paper, we propose an approach to increase the reliability of RFID (Radio Frequency IDentification), not relying on the performance of each devices, but relying on a mechanism of entire networked system, which manages objects and/or people in the real world with RFID tags. We identified there exist many factors to reduce the accurate identifications of RFID tags, which results in the reduction of the total-system reliability. Moreover, we show the effect of our approach in diverse parameters such as the number of misidentifacions, the length of transportations, the number of RFID readers.