A method and system for timely transferring electronic mail message over a
communication network such as the Internet to a communication terminal to
be transferred in accordance with a transfer trigger condition attached
to the electronic mail message in advance, the trigger condition being
specified by event information such as the movement and the operation of
household appliance, living facility or positional information of
specific terminal unit or other signals detected on the communication
network. According to the present method, an electronic mail message is
first sent to a communication server apparatus equipped on a
communication network together with the transfer trigger condition, and
after registering of the mail message, the communication server apparatus
watches the transfer trigger condition and transfers the corresponding
mail message of which transfer trigger condition meets a predetermined
condition to a communication terminal unit to be transferred when the
transfer trigger condition meets the predetermined condition.