A mobile wireless communication system includes information, a portable terminal,
a plurality of wireless communication gateway servers, a switching apparatus, and
a wireless telephony server. The switching apparatus sets a connection between
the portable terminal and a first wireless communication gateway server or another
connection between the portable terminal and a second wireless communication gateway
server when the first wireless communication gateway server is congested. The wireless
telephony server informs a position of the portable terminal to the wireless communication
gateway server.