In this paper, we propose the improvement scheme of the WLAN positioning system using spot information. When using
this system, a user first sends a spot name in front of him explicitly and BSSID and received signal strength information
from WLAN implicitly to a positioning server. This system requests one extra action as inputting a spot name for a user,
and conventional WLAN positioning systems would not request this action. However, we consider that a user accepts
this one action for specifying his correct position.
Construction of the DB of spot information is one of the important subjects. We consider the subject in other paper[8][9]. So it is out of scope in this paper.