| 摘要 |
PROBLEM TO BE SOLVED: To prompt users to provide positional information with consideration given to the privacy of positional information. SOLUTION: A plurality of base stations 21 are installed at specified intervals in a department store 50, and the positions of simplified portable sets 10 are detected by the unit of wireless cells of the base stations 21. The detection of the positions of the simplified portable sets 10 is performed only in an object area, for example, the department store 50, and is not performed out of the object area. Information required for the position detection is downloaded from a service management server 30 to the simplified portable sets.
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