There is provided an endoscopic system. The system comprises a flexible endoscope insertable into a first tubular organ from a natural opening of a human body. The system further comprises an opening member which forms on a wall part of the first tubular organ an opening used to insert the endoscope into an abdominal cavity from the first tubular organ in the body, an anastomosing member which is able to anastomoses the first tubular organ with a second tubular organ in the abdominal cavity, and a cutting member with which the second tubular organ is able to be cut.