1. A locus correcting method for correcting a traveling locus of a mobile object by a locus correcting apparatus, the locus correcting apparatus comprising a plurality of measurement means, wherein the locus correcting apparatus performs: setting a plurality of nodes on locus data of the mobile object acquired by one unit of measurement means; correlating position data of the mobile object acquired by the one unit of measurement means to the nodes and correlating position data of the mobile object acquired by other units of measurement means than the one unit of measurement means to the nodes; representing positions at which the nodes may occur by probability; representing positions at which position data correlated to the nodes may occur by probability; calculating an evaluation function including the nodes and the position data as variables, based on each probability; and calculating a locus on which each node occurs with largest probability, based on the evaluation function.