Collision risk calculation method, collision risk calculation device, and computer-readable recording medium

A collision risk calculation method comprising:

• acquiring traveling information on a position and a speed of each of a first ship and a second ship, by a processor;
• calculating a future traveling direction range of one or both of the first ship and the second ship based on a position of each of the first ship and the second ship and traveling information of a ship that sailed in a past, by the processor;
• and
• calculating a risk of collision between the first ship and the second ship based on the future traveling direction range, by the processor.

A collision risk calculation device comprising:

• a processor configured to:
• acquire traveling information on a position and a speed of each of a first ship and a second ship;
• calculate a future traveling direction range of one or both of the first ship and the second ship based on a position of each of the first ship and the second ship and traveling information of a ship that sailed in a past;
• and
• calculate a risk of collision between the first ship and the second ship based on the future traveling direction range.