The image acquisition means acquires a captured image by an endoscope. The position acquisition means acquires positional information of the endoscope. The lesion detection means detects a lesion from the captured image. The washing degree determination means determines a degree of intestinal tract washing from the captured image. The reaching determination means determines that the endoscope reaches a cecum from the captured image. The end determination means determines an end timing of an examination by the endoscope. The calculation means calculates an observation time based on a timing that the endoscope reaches the cecum and the end timing. The report generation means generates an examination report including the observation time, the degree of intestinal tract washing, a presence or absence of reaching the cecum of the endoscope, and a detection result of the lesion including the positional information of the lesion. The generated examination report is displayed on the display device.