The present invention relates to a system and method for preventing a collision between vessels or a vessel and an obstacle. According to the present invention, a conventional vessel traffic service (VTS) has difficulty in rapidly increasing complexities of task performance as the number of vessels to be controlled increases because possibilities of collision between multiple vessels or multiple vessels and multiple fixed obstacles should be independently identified and a precaution should be taken. To this end, the present invention provides a control system for avoiding a collision between multiple vessels using a time series graphic display wherein the control system calculates variations of the relative distance depending on time with respect to each vessel and obstacle on the basis of the current position and movement velocity of the vessel and the obstacle such as a bridge to display the same with the time series graphic. At this time, the control system of the present invention normalizes lower values with respect to an allowance distance and time for each vessel to display the distance variation in accordance with time elapses between each vessel in the time series graphic so positions of the vessels at sea and obstacles, crossing time, and whether or not the vessels to be burdened can be easily recognized at once, thereby helping prompt a precise circumstance determination, and at the same time, allowing complexity of task performance on collision determination not to increase even if the number of vessels to be controlled increases.
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