| 摘要 |
A transmission/reception unit 51 of a management system 50aa transmits state information after change that indicates a state of a changed terminal 10aa to a management system 50cd connected to a terminal 10db. Consequently, the terminal 10db can grasp the state of the terminal 10aa through the management system 50cd. Thus, there is an effect that the terminal 10db can request start of communication with the terminal 10aa at a proper timing. |
