| 摘要 |
In a mobile terminal in which a communication service is being executed, communication networks can be switched without causing a loss of communication data while maintaining the execution of the communication service. In a server which provides a communication service via communication networks provided in parallel and a mobile terminal which obtains the communication service using one of the communication networks, the mobile terminal activates another communication network in parallel while maintaining execution of the communication service to thereby transmit pieces of information having the same content, generated by copying, through the respective communication networks, and switches the one communication network being used to the other communication network.
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