A client apparatus to which data or a function is provided from a server apparatus, including: a monitoring unit configured to monitor monitoring target software, and detect an abnormal state or unauthorized state of the target software; a server management unit configured to manage an address of the server apparatus that is being accessed by the client apparatus; an abnormality information creation unit configured to create abnormality information from the abnormal state or the unauthorized state, which is detected by the monitoring unit; and an abnormality information notification unit configured to issue the abnormality information to the server apparatus managed by the server management unit.