PURPOSE: To quickly extract the nearest movable body by a car location system with comparatively low accuracy without generating a large error by dividing an object range into plural areas having comparatively high correlation between a road distance and a straight distance, comparing a distance between a prescribed point regulated by a node on a network and a movable body and extracting the nearest movable body.

CONSTITUTION: A nearest vehicle extracting means 16 selects the necessary number of fire engines 1 existing near a diaster field based upon the positional information of fire engines 1 to be turned out and the coordinates of the disaster field. The range of the field is divided into plural areas having compratively high correlation between a road distance and a straight line and a network is constituted of movable body nodes indicating the positions of the fire engines 1, a prescribed point node indicating the position of the disaster field, a boundary node indicating a position capable of passing on the boundary of the area, and a link connecting respective nodes in the same area including a boundary by a straight line. Then a movable node having the smallest sum of link lengths of the shortest route from the prescribed point node on the network routes is searched.