TRAJECTORY DATA ANALYSIS DEVICE, TRAJECTORY DATA ANALYSIS METHOD, AND PROGRAM

PROBLEM TO BE SOLVED: To compare or sort trajectory data between different measurement environments.SOLUTION: A trajectory data analysis device includes: a knot creating unit 403 which converts two-dimensional trajectory data acquired in a measurement environment to a three-dimensional curve by sterically crossing at an intersection, to output a knot based on the curve; a knot invariant calculation unit 404 which calculates invariant of the knot; and a feature analysis unit 405 which decomposes the invariant calculated by the knot invariant calculation unit 404 into multiple kinds of prime knot groups determined in advance in a database 406, for multiple pieces of trajectory data acquired in the measurement environment, determines an occurrence frequency distribution of the prime knot, and creates a feature vector of the trajectory data in the measurement environment on the basis of the occurrence frequency distribution.