The present invention provides a safety prevention system and program, capable of preventing illogical entry, further improving safety prevention level, and carrying a delicate gate inhibition management to each entering person. The safety prevention system of the invention is a safety prevention system (S) for gate inhibition management of management areas including buildings, includes a reader (12) reading recognition information of a non-contact authentication medium (14) presented by personnel (15) when entering; a biological authentication system (13) reading biological information of the personnel (15) when entering; and a safety prevention control device (16) connected with the reader (12) and the biological authentication system (13), implementing an authentication of entry according to the authentication medium recognition information read by the reader (12) and the biological information read by the biological authentication system (13), so as to control the release or non release of safety prevention.