Patent ID: 8165601

Claim:
A positioning information system including: a plurality of positioning information transmission devices, installed in a region having a predetermined extent, each of which transmits unique positioning identification information; a mobile communication terminal with positioning function having a mobile communication radio communication unit to receive the transmitted positioning identification information and transmit the received positioning identification information as mobile communication radio information; and a positioning information management server configured to read the positioning identification information from the transmitted mobile communication radio information, convert the positioning identification information into position identification information representing a predetermined installation point, and return the converted position identification information as mobile communication radio information to the mobile communication terminal with positioning function, allocate a unique position identification information to the predetermined installation point, wherein transmission device fixed identification information is allocated to the positioning information transmission device, wherein the positioning information transmission device is configured to hold the transmission device fixed identification information, and transmit the positioning identification information corresponding to the transmission device fixed identification information, wherein the positioning information management server is configured to use a position identification information correspondence table describing correspondence between the transmission device fixed identification information of the positioning information transmission device and the position identification information, read concealed variable identification information and concealed key identification information from the positioning identification information received from the positioning information transmission device, perform decoding processing on the concealed variable identification information using the read concealed key identification information, decode the transmission device-specific transmission device fixed identification information, make retrieval in the position identification information correspondence table, and perform conversion to the position identification information linked to the decoded transmission device fixed identification information, wherein the positioning information transmission device is further configured to repeat generation and transmission of the positioning identification information, and wherein the positioning information management server is further configured to repeat decoding of the transmitted positioning identification information.