Abstract: According to an embodiment, a position estimation device is for estimating a position of a second terminal in a wireless network. The wireless network included a plurality of terminals including three or more first terminals whose positions are known and the second terminal whose position is unknown. The device includes a first probability calculator and a position estimator. The first probability calculator calculates a first connection probability on the basis of a distance and a smallest hop count between two of the plurality of terminals over which and with which the two terminals are connected. The position estimator obtains a likelihood on the basis of the first connection probability and estimates a position of the second terminal by using the likelihood.

Abstract: According to an embodiment, a position calculation method includes obtaining a plurality of candidate positions each of which represents a position of a corresponding one of a plurality of base stations to be installed in a wireless network; calculating a condition of an optimization problem for deciding installation positions of base stations from the candidate positions by using probabilities of connection between a plurality of terminals included in the wireless network and the base stations installed at the candidate positions; and calculating the installation positions by solving the optimization problem under the condition.