A control method for correcting lateral movement of a ship including a ship handling device disposed in a ship body, the ship being further provided with a port side and a starboard side forward/backward propeller for generating thrust in forward and backward direction of the ship by power transmitted from an engine via a propeller shaft and with a side thruster for generating thrust in left and right direction of the ship, wherein the ship handling device comprises a joystick lever for indicating a propulsion direction of the ship and a magnitude of thrust by way of a tilt direction and a tilt amount and indicating a direction and a magnitude of moment generated by the ship from thrust by way of a rotation direction and a rotation amount, the control method characterized by: acquiring (step S120) a signal corresponding to a tilt direction and an operation amount of the tilting operation on the joystick lever; generating (step S130) a lateral movement thrust by the side thruster in accordance with a tilting operation of the joystick lever in one left or right direction; acquiring (step S140) a signal corresponding to a rotating operation direction and an operation amount of the rotating operation on the joystick lever for canceling out a rotation moment generated by the thrust generated by the side thruster; rotating (step S150) the port side forward/backward propeller and the starboard side forward/backward propeller in accordance with the rotating operation direction and the operation amount of the joystick lever in such a manner that a thrust difference (ΔT0) is generated between the port side and the starboard side forward/backward propellers; and calculating (step S170) a first correction coefficient based on the lateral movement thrust generated by the side thruster and the thrust difference (ΔT0) generated between the port side and the starboard side forward/backward propellers for calculating a first correction thrust with respect to the lateral movement thrust to cancel out the rotation moment involved in the lateral movement. acquiring (step S120) a signal corresponding to a tilt direction and an operation amount of the tilting operation on the joystick lever; generating (step S130) a lateral movement thrust by the side thruster in accordance with a tilting operation of the joystick lever in one left or right direction; acquiring (step S140) a signal corresponding to a rotating operation direction and an operation amount of the rotating operation on the joystick lever for canceling out a rotation moment generated by the thrust generated by the side thruster; rotating (step S150) the port side forward/backward propeller and the starboard side forward/backward propeller in accordance with the rotating operation direction and the operation amount of the joystick lever in such a manner that a thrust difference (ΔT0) is generated between the port side and the starboard side forward/backward propellers; and calculating (step S170) a first correction coefficient based on the lateral movement thrust generated by the side thruster and the thrust difference (ΔT0) generated between the port side and the starboard side forward/backward propellers for calculating a first correction thrust with respect to the lateral movement thrust to cancel out the rotation moment involved in the lateral movement.