Patent ID: 7800532

Claim:
A position determination method comprising: performing a positioning process that calculates a located position by performing positioning calculations using satellite signals; determining whether or not a convergence condition is satisfied based on current and preceding positioning results when the positioning process is performed, the convergence condition being specified as a condition for determining whether or not the positioning results of the repeated positioning processes have converged; and determining the located position calculated by the current positioning process to be an output position when the convergence condition is satisfied; and acquiring a reference altitude corresponding to a two-dimensional position of the located position calculated by the current positioning process from given altitude information or a given server when the positioning process is performed, and determining whether or not a difference between the altitude of the located position calculated by the current positioning process and the acquired reference altitude satisfies a given altitude difference condition, the located position calculated by the current positioning process being determined to be the output position when the altitude difference condition and the convergence condition are satisfied.