An image forming apparatus monitoring system which is configured so as to reduce an installing operation load for installation of image forming apparatuses including settings relating to monitoring apparatus. In the present system, when a multi-function machine determines that it is not registered in the image forming apparatus monitoring system, the multi-function machine searches for a monitoring apparatus 105 which matches the multi-function machine, and selects the monitoring apparatus 105 which is to monitor the multi-function machine, based on monitoring apparatus information acquired from the searched monitoring apparatus 105. When receiving a notification of the start of monitoring from the selected monitoring apparatus 105, the multi-function machine stores the notification in a storage area as registration completion information. On the other hand, the monitoring apparatus 105 transmits monitor request information received from the multi-function machine to the monitoring host 101, and starts monitoring the multi-function machine when determining from the result of the monitor request that registration of the multi-function machine in the monitoring host 101 is completed.