A radiocommunication system including a portable terminal, a base station and
a
server. The portable terminal transmits a destination to the server and further
sends the ID number (CS_ID) of the base station coupled through a radio link to
the portable terminal. The server has a table representative of a corresponding
relationship between the ID number of the base station and the standing position
of the base station and retrieves the position corresponding to the ID number thereof
as the present position of the portable terminal from the table. Further, the server
transmits map data corresponding to the present position of the portable terminal
to the portable terminal.
