Patent ID: 7061384

Claim:
A positional information management system comprising: a positional information management server including a memory and a clock; a card carried by a user in a facility and having a tag IC storing a tag ID; and a plurality of detectors communicating with the positional information management server, each detector having a detector ID and a detection range and being installed at a respective location in the facility for detecting presence of the card when the card is located within the detection range of the respective detector, for detecting the tag ID via a signal transmitted from the tag IC, each detector transmitting to the positional information management server the tag ID detected and the detector ID of the receiver detecting the tag ID, the memory recording together the tag ID, the detector ID of the detector, and, from the clock, time at which the detector has detected the tag ID, for managing positional information regarding the user, based on the tag ID, the detector IDs, and the times recorded.