Network connection control technique, network connection technique and authentication apparatus

摘要

A network connection method includes: generating the same address as an address that is other than address currently used by the user terminal and is generated by the authentication apparatus, as a reconnection address, and storing the reconnection address that is valid for a predetermined valid period into a reconnection address storage device; and when a present time is within the predetermined valid period after the connection with the first network is disconnected, reconnecting to the first network by using the reconnection address stored in the reconnection address storage device without the authentication by the authentication apparatus.