Abstract: A crime prevention monitor system which, when detecting an intruder entering into a monitor region, automatically judges quickly and reliably whether or not the intruder is an illegally intruding person on the side of its concentrator center and if so, then issues a highly reliable report to such a restraint organization as a police station. In the system, an image database having image data of authorized persons for the respective monitor regions previously registered therein is provided in the concentrator center so that, when the intruder is present in the monitor region, the image data of the intruder is sampled through a monitor camera and collated with the image data of the authorized persons of the monitor region in question, whereby, when the intruder does not correspond to any of the authorized persons of the associated monitor region, the system determines that the intruder is illegal and reports the presence of the intruder to the restraint organization.