The present invention includes a probe in contact with a measurement site, and an electrophysiological nerve stimulation unit that applies stimulation to a local brain or cranial nerve by emitting an electrical stimulation signal through the probe, and detecting the position of the probe on the measurement site. A probe position detection unit, the probe is electrically connected to a detector, and a nerve monitoring unit configured to detect an electrical response signal of the brain or cranial nerve according to an electrical stimulation signal by the detector, the nerve stimulation unit, the probe position detection unit, and a nerve monitoring unit. Responsive cranial nerves that are electrically connected and respond to electrical signals among nerves in the brain region where the probe is located based on the position of the probe detected by the probe position detection unit and the corresponding electrical response signal detected by the nerve monitoring unit. , Distinguish non-reactive cranial nerves that did not respond to electrical signals, calculate a three-dimensional coordinate system for the responsive cranial nerve and non-reactive cranial nerve, and calculate the three-dimensional coordinate system of the reactive and non-reactive cranial nerves calculated on the previously collected brain shape images. Electrophysiology to confirm damage to cranial nerve function, including a microcomputer that substitutes and maps to a three-dimensional cranial nerve image, and a display unit that is electrically connected to the microcomputer and displays a three-dimensionally mapped cranial nerve image on a screen. While stimulating the cranial nerves with a medical stimulating means, by detecting the reactive and non-reactive cranial nerves corresponding thereto, and mapping and displaying the three-dimensional cranial nerve images according to the reactive and non-reactive cranial nerves, the structure of the cranial nerve and the brain with one device It pro
