| 摘要 |
PROBLEM TO BE SOLVED: To enable estimation of the present position of a terminal device even in an environment in which reception signal intensity easily fluctuates in the case of estimating the present position by triangular positioning requiring for the terminal device to receive a radio wave.SOLUTION: A terminal device 3 comprises a beacon signal receiving unit 31, a storage unit 32, and a position estimating unit 33. The beacon signal receiving unit 31 obtains a beacon ID from the received beacon signal, and measures reception signal intensity of the beacon signal. The storage unit 32 stores first measurement data indicating reception signal intensity in the case where the beacon signal is received at a vicinity measurement position of a beacon device 1 and second measurement data indicating reception signal intensity in the case where the beacon signal is received at an intermediate measurement position of an adjacent beacon device 1. The position estimating unit 33 estimates the present position on the basis of the reception signal intensity of the beacon signal, a first threshold value corresponding to the first measurement data and a second threshold value corresponding to the second measurement data. |
