A plurality of terminals connected to a network distribution-process
update notifications of information and data obtainment, thereby
constructing an information notifying network which needs no server. In
the network constructed by a plurality of terminals, when the user
updates the information on the terminal, each terminal functions as an
information provider terminal for informing another terminal that the
information has been updated and transferring the updated information,
and when another user updates the information on another terminal, each
terminal functions as an information receiver terminal for receiving the
update notification from the information provider terminal and the
updated information.