Patent ID: 8472975

Claim:
A positioning support system comprising: a processor including an approximate positional information storage unit that stores approximate positional information is used to calculate a position of a communication terminal, the approximate positional information indicating a position of a cell where the communication terminal is located and including information identifying the cell associated with, the approximate positional information; an approximate positional information transmitting unit to acquire, based on a positioning information transmission request including the information identifying the cell and which is transmitted from the communication terminal, the approximate positional information associated with the information identifying the cell from the approximate positional information storage unit, the approximate positional information transmitting unit transmitting the approximate positional information to the communication terminal; a positioning result receiving unit to receive positioning result information transmitted from the communication terminal indicating a result of the positioning calculation; and an approximate positional information updating unit to update the approximate positional information stored in the approximate positional information storage unit based on the positioning result information wherein the cell corresponds to a network different from a network that includes the positioning support system, and the approximate positional information stored in the approximate positional information storage unit was previously determined in a previous positioning determination of the cell.