| 摘要 |
<p>High-precision approximate positional information is transmitted to a communication terminal. In an approximate positional information DB (23) of a SUPL server (20) included in a positioning support system (10), approximate positional information that is used for positioning calculation in a communication terminal (60) and indicates the position of a cell (C1) in which the communication terminal (60) is present, and a cell ID that specifies the cell (C1) are associated and stored. On the basis of a positioning information transmission request including the cell ID, which is transmitted from the communication terminal (60), the approximate positional information stored in the approximate positional information DB (23) is acquired and transmitted from a communication unit (21) to the communication terminal (60). Positioning result information that is information indicating the result of the positioning calculation and transmitted from the communication terminal (60) is received, and on the basis of this information, the approximate positional information stored in the approximate positional information DB (23) is updated by a control unit (22). The accuracy of the approximate positional information is improved by updating the approximate positional information stored in the approximate positional information DB (23) by the positioning result information.</p> |
