A ship maneuvering control method of optimizing a route of a ship, comprising the steps of: acquiring estimated encounter marine phenomenon information based on actually encountered marine phenomenon information and marine phenomenon statistical information which are acquired by measuring, on the ship, marine phenomena that the ship encounters during sail, the estimated encounter marine phenomenon information being information from a first time that is a current time until a second time that is a near-future time in a route surrounding marine area; acquiring operation performance information by measuring, on the ship, an operation performance of the ship during the sail; and designing a short-term planned route which is a route from a start position that is a ship position at the first time up to an end position that is the ship position at the second time and by which a value of a first evaluation function becomes an optimal value, the short-term planned route being designed based on a planned route, the estimated encounter marine phenomenon information, the operation performance information, and a hull motion model of the ship, the planned route being designed based on meteorological and marine phenomena prediction information and the performance information of the ship such that the ship sails from a starting point up to a destination, wherein the first evaluation function contains: an index indicating an influence of a fluctuation portion between a planned position that is the ship position planned at the second time on the planned route and the end position; a fuel consumption index when the ship sails along the short-term planned route; and a safety index when the ship sails along the short-term planned route. acquiring estimated encounter marine phenomenon information based on actually encountered marine phenomenon information and marine phenomenon statistical information which are acquired by measuring, on the ship, marine phenomena that the ship encounters during sail, the estimated encounter marine phenomenon information being information from a first time that is a current time until a second time that is a near-future time in a route surrounding marine area; acquiring operation performance information by measuring, on the ship, an operation performance of the ship during the sail; and designing a short-term planned route which is a route from a start position that is a ship position at the first time up to an end position that is the ship position at the second time and by which a value of a first evaluation function becomes an optimal value, the short-term planned route being designed based on a planned route, the estimated encounter marine phenomenon information, the operation performance information, and a hull motion model of the ship, the planned route being designed based on meteorological and marine phenomena prediction information and the performance information of the ship such that the ship sails from a starting point up to a destination, wherein the first evaluation function contains: an index indicating an influence of a fluctuation portion between a planned position that is the ship position planned at the second time on the planned route and the end position; a fuel consumption index when the ship sails along the short-term planned route; and a safety index when the ship sails along the short-term planned route.