An apparatus for supporting docking of a marine vessel includes a distance measuring unit which measures a distance between the marine vessel and a candidate docking site, a distance measurement controlling unit which controls the distance measuring unit to measure distances between the marine vessel and at least three measurement points defined around the candidate docking site, a configuration evaluating unit which evaluates the configuration of the candidate docking site based on the distances between the marine vessel and the at least three measurement points, and a docking suitability judging unit which judges, based on the result of the evaluation, whether or not the candidate docking site is suitable for docking of the marine vessel.