An endoscopic image processing system processes an image signal produced by picking up the image of an intracavitary region of an object to be examined using an electronic endoscope. The endoscopic image processing system includes a detection unit that detects at least one of the type of electronic endoscope connected to the endoscopic image processing system, based on information inherent to the electronic endoscope, and the type of image pickup device incorporated in the connected electronic endoscope, and an image processing unit processes the image signal produced by the electronic endoscope according to the signal level of the image signal. A domain designation unit designates a first domain to be processed by the image processing unit within the image data according to the detected type of electronic endoscope.