| 摘要 |
<P>PROBLEM TO BE SOLVED: To automatically restrict the use of a designated function when entering a zone in which the use of a radio portable terminal is restricted, such as a hospital and a theater. <P>SOLUTION: At the doorway of the zone 3 in which the use of the radio portable terminal 1 is restricted, first short range radio communication equipment 4 for transmitting a first signal and second short range radio communication equipment 5 for transmitting a second signal are arranged adjacently. As a result, when the radio portable terminal 1 moves in the doorway while receiving both the signals, it is determined that entrance is made when the reception level of the second signal exceeds that of the first one, and the use of the function of the radio portable terminal 1 is restricted, based on use restriction information transmitted with one of both the signals. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
