A mobile communication terminal device which includes a plurality of
different communication interfaces that are automatically switched for
making a communication. The stable connection is ensured whether the
terminal device remains at rest or is moving by monitoring positional
information on the terminal device for a moving situation thereof to
control a selection from a plurality of physical interfaces. This
selection control involves selecting a connection to a narrow range
communication such as wireless LAN which is inexpensive and stable when
the terminal device remains at rest, and selecting a connection for a
communication through a portable telephone which provides a connection
over a wider range when the terminal device is moving. Also, a connection
for a communication is automatically selected from the positional
information, thereby permitting an automatic selection of a connection
intended by the user.