Treatment system and method of operating the treatment system

A method of operating a treatment system, the treatment system including:

• a treatment instrument configured to cut living tissue in a liquid;
• an endoscope configured to capture an endoscopic image that includes an image of the treatment instrument and an image of the living tissue;
• a support data storage configured to store, as support data to assist in a cutting treatment, at least one:
• of data relating to a posture of the treatment instrument and image data on a location of a treatment section of the treatment instrument;
• a support data generator configured to generate support data to be displayed on a display based on the support data stored;
• a controller;
• and
• a turbidity detector configured to detect a degree of cloudiness of the liquid, the method comprising:
• displaying, with the controller, the support data together with the endoscopic image;
• and
• switching, with the controller, a display form of the support data generated by the support data generator based on a degree of cloudiness of the liquid detected by the turbidity detector.