| 摘要 |
PROBLEM TO BE SOLVED: To suppress power consumption by decreasing the quantity of control information received within a network so as to inform its opposite terminal or the like of the position of a mobile terminal, in a communication system using, for example, the internet. SOLUTION: A mobile terminal for communication is equipped with a terminal position information notice means which informs the data transfer devices corresponding severally to its opposite terminal, the area of the home link of itself, the area where it exists now, and the area where it existed just before en block of the plural sets of positional information of termini where each set consists of the positional information of each of plural areas for specifying each of the areas, to which it is slated to shift next and an existence time showing the slated period when it exists in each of the plural areas.
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