A network system, a network server and a terminal device, capable of
easily and surely transmitting various information to a user being the
destination of the information. The terminal device to be used by a user
is recorded in the network server 22. The network server 22 converts
information to be transmitted to the terminal device used by the user
into information conformed to the terminal device used by the user, or
transmits a notice to the terminal device to the effect that there is
information to be transmitted to said user. Thereby, the information can
be easily and surely transmitted to the user who is the destination of
the information.