Certification system, certification method and certification program

摘要

The certification system (1), when first there is access, the control control equipment (10) with the suffering control control equipment (20a) with does early certification bidirectionally in between making use of the channel of specified frequency. When the result of the certification, the control control equipment (10) and the suffering control control equipment (20a) is legitimate, when it is certified, the control control equipment (10), the use channel memory section (13b) the frequency where other than of the frequency which is remembered is not utilized is selected. And, the control control equipment (10) and the suffering control control equipment (20a), the control control equipment (10) with the suffering control control equipment (20a) with is changed to the channel of the frequency which the channel between is selected. After that, the control control equipment (10) and the suffering control control equipment (20a), in every specified time the control control equipment (10) with the suffering control control equipment (20a) with always you certify bidirectionally in between making use of the channel which is changed.