A portable terminal of this invention has a portable phone control section which
performs processing for a portable phone via a radio wave in a certain frequency
band. This portable terminal also has a transmission section and a reception section
which have respective functions as an on-board machine in an electronic toll collection
system and transacts ETC information on automatic toll collection to and from a
radio equipment installed at a tollgate via a radio wave in a different frequency
band. A common control unit also provided in the portable terminal controls switching
between the functions as the terminal and the machine according to the frequency
band of the received radio wave. Thus, the electronic toll collection system can
be used by the user at a low cost, and also established as the infrastructure.
