| 摘要 |
<p>Base stations (BS1-1, BS1-2, BS1-3) of a communication system (S1) belong to a sub-network (SN1), which is connected to the Internet IN by way of a gateway (GW1). Base stations (BS2-1, BS2-2, BS2-3) of another communication system (S2) belong to sub-network (SN2), which is connected to the Internet IN by way of another gateway (GW2). A mobile terminal (20) communicates with a server SV by using one of the communication systems (S1, S2). In this case, the mobile terminal (20) includes mobile station network interfaces (22a, 22b) which can access to the communication systems (S1, S2), and is designed to switch communication systems by means of a communication system switching unit. <IMAGE></p> |
