An endoscope system for performing an examination of a lumen of a patient, the endoscope system comprising: an insertion part configured to be inserted into the lumen; a camera configured to perform image capturing of the lumen to obtain an endoscopic image; a region-of-interest detection unit configured to detect a region of interest from the endoscopic image; a detection result notification unit configured to give a notification of a result of detection of the region of interest; an insertion-withdrawal determination unit configured to determine whether a step in the examination is an insertion step in which the insertion part is inserted up to a return point in the lumen or a withdrawal step in which the insertion part is withdrawn from the return point; and a notification control unit configured to cause the detection result notification unit to give the notification in accordance with the step determined by the insertion-withdrawal determination unit; wherein the detection result notification unit comprises a display notification unit configured to give a notification of detection of the region of interest by display on a display, and characterized in that the notification control unit is configured to cause the display notification unit to superimpose on the endoscopic image and display a geometric shape that indicates an area of the region of interest at a position of the region of interest only at a time of detection of the region of interest in the insertion step, and to cause the display notification unit to superimpose on the endoscopic image and display the geometric shape that indicates the area of the region of interest at the position of the region of interest at the time of detection of the region of interest and keep displaying the geometric shape for a certain period after the detection in the withdrawal step. an insertion part configured to be inserted into the lumen; a camera configured to perform image capturing of the lumen to obtain an endoscopic image; a region-of-interest detection unit configured to detect a region of interest from the endoscopic image; a detection result notification unit configured to give a notification of a result of detection of the region of interest; an insertion-withdrawal determination unit configured to determine whether a step in the examination is an insertion step in which the insertion part is inserted up to a return point in the lumen or a withdrawal step in which the insertion part is withdrawn from the return point; and a notification control unit configured to cause the detection result notification unit to give the notification in accordance with the step determined by the insertion-withdrawal determination unit; wherein the detection result notification unit comprises a display notification unit configured to give a notification of detection of the region of interest by display on a display, and characterized in that the notification control unit is configured to cause the display notification unit to superimpose on the endoscopic image and display a geometric shape that indicates an area of the region of interest at a position of the region of interest only at a time of detection of the region of interest in the insertion step, and to cause the display notification unit to superimpose on the endoscopic image and display the geometric shape that indicates the area of the region of interest at the position of the region of interest at the time of detection of the region of interest and keep displaying the geometric shape for a certain period after the detection in the withdrawal step.