A search system comprising: a position information terminal for being held by a search target in use and configured to transmit position information of the search target; a processing unit configured to perform calculation processing; a search route processor configured to calculate, using the processing unit, a plurality of search routes between respective locations of a plurality of searchers (3, 4, 5) belonging to a predetermined area and the search target based on the position information of the search target acquired from the position information terminal; and a plurality of portable terminals (T3, T4, T5) for being held by the plurality of searchers (3, 4, 5) in use, each portable terminal configured to transmit position information of a respective searcher (3, 4, 5), and to display a respective search route calculated by the search route processor and personal information for identifying the search target, wherein both the plurality of searchers (3, 4, 5) and the search target are movable, the search route processor is configured to compare the plurality of search routes with each other to identify a shortest first search route, issue a search command to a first searcher on the first search route to cause the first searcher to start searching along the first search route displayed on corresponding one of the portable terminals (T3, T4, T5), update the position information of the search target and the search routes as the search target moves, when a second search route is shorter than the first search route, issue a search command to a second searcher on the second search route to cause the second searcher to start the searching along the second search route displayed on corresponding one of the portable terminals (T3, T4, T5), the system being characterized in that the plurality of portable terminals (T3, T4, T5) is configured to display the position information of the search target and the search routes by a vector map display acquired from a geographic information system in which each intersection is identified as a node and a road is identified as a line based on the position information of the search target, wherein the search route processor is configured to assign a line number and a node number from a position of the search target to the searchers (3, 4, 5) such that the line number and the node number increase every time the node is passed, and the plurality of portable terminals (T3, T4, T5) is configured to update and display information indicating a positional relationship on the vector map display every time line numbers or node numbers of the searchers (3, 4, 5) and the search target change on a display screen. a position information terminal for being held by a search target in use and configured to transmit position information of the search target; a processing unit configured to perform calculation processing; a search route processor configured to calculate, using the processing unit, a plurality of search routes between respective locations of a plurality of searchers (3, 4, 5) belonging to a predetermined area and the search target based on the position information of the search target acquired from the position information terminal; and a plurality of portable terminals (T3, T4, T5) for being held by the plurality of searchers (3, 4, 5) in use, each portable terminal configured to transmit position information of a respective searcher (3, 4, 5), and to display a respective search route calculated by the search route processor and personal information for identifying the search target, wherein both the plurality of searchers (3, 4, 5) and the search target are movable, the search route processor is configured to compare the plurality of search routes with each other to identify a shortest first search route, issue a search command to a first searcher on the first search route to cause the first searcher to start searching along the first search route displayed on corresponding one of the portable terminals (T3, T4, T5), update the position information of the search target and the search routes as the search target moves, when a second search route is shorter than the first search route, issue a search command to a second searcher on the second search route to cause the second searcher to start the searching along the second search route displayed on corresponding one of the portable terminals (T3, T4, T5), the system being characterized in that the plurality of portable terminals (T3, T4, T5) is configured to display the position information of the search target and the search routes by a vector map display acquired from a geographic information system in which each intersection is identified as a node and a road is identified as a line based on the position information of the search target, wherein the search route processor is configured to assign a line number and a node number from a position of the search target to the searchers (3, 4, 5) such that the line number and the node number increase every time the node is passed, and the plurality of portable terminals (T3, T4, T5) is configured to update and display information indicating a positional relationship on the vector map display every time line numbers or node numbers of the searchers (3, 4, 5) and the search target change on a display screen.