A position information plot means 81 plots a position information log containing a user's measurement position and measurement date/time on a multidimensional space defined by numerical information indicating the measurement position and a time. A stay point cluster extraction means 82 weights the position information log so that a Euclidean distance in a time direction relative to a position information space is easily determined as short, and clusters the weighted position information logs thereby to extract a stay point where the user frequently stays. A moving path cluster extraction means 84 weights a position information log at a non-stay point so that a Euclidean distance in a time direction relative to a position information space is easily determined as long, and clusters the weighted position information logs thereby to extract a user's moving path.
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