| 摘要 |
A communication system of the invention includes a communication terminal correctable to first and second communication networks, and a controller for controlling service provision to the communication terminal according to which one of the first and second communication networks the communication terminal is connected to. The communication terminal includes: a reception determination unit for determining a reception condition of a control signal transmitted from the first communication network; and a notification transmitter for transmitting, to the controller, a notification indicating that the control signal can be received when the reception condition satisfies a certain requirement. The controller includes: a detector for detecting that the communication terminal can receive the control signal according to the notification; and a connection determination unit for determining that the communication terminal is connected to the first communication network when the communication terminal can receive the control signal while being connected to the second communication network.
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