Fecha de publicación: 02/01/2020 Fuente: Wipo "IOT" [Problem] The purpose of the present invention is to provide a computer system, an IoT device monitoring method, and a program for which security has been improved. [Solution] A computer system for monitoring a connected IoT device 100, the computer system: monitoring the login state of the IoT device 100; detecting fraudulent access on the basis of the monitoring results; learning an ID and/or a password of the detected fraudulent access; determining whether the ID and/or the password previously possessed by the IoT device 100 is easily cancelled; and performing control such that the IoT devices 100 to be accessed for making the determination are accessed in a prescribed priority order.