To provide a service to a user by allowing recognition of a termination time of a trial feature related to an optional feature provided without charge, the necessity of continuation of the trial feature and which trial feature is used as a regular optional feature even if a service person or the like does not go to the location of the user, and thereby reducing the cost of a service to the user and saving time.

A notification message is created based on usage of a trial function in an image processor 1, and transmitted to a monitoring site 204 via a network line 40. The monitoring site 204 analyzes a display screen created by using the notification message to recognize the termination of the trial period of a trial feature and recognizes which trial feature is desirable for a user to continuously use as a regular optional feature.