less work and cost only for upgrade of the operation console when a computer that serves as an operation console is bought or leased from the other distributor b the operation console is not covered by the maintenance services provided by the vendor a in such a case it may be impossible to ascertain the status of the operation console and provide timely information to the customer in accordance with the determined status therefore the device monitoring program is installed in the hdd 14 of the operation console 104 as mentioned above for implementing a function of monitoring the status of the operation console 104 the device monitoring program is a program for monitoring several categories of operation console 104 status and issuing an event to the center server 202 in accordance with the status in this embodiment the following status items are monitored for example this item is monitored because a lengthy hard disk use period leads to a high risk of failure which may reduce the reliability of the apparatus if the available capacity of a hard disk is reduced problems occur for example a new version of the image reconstruction program cannot be installed or image data generated cannot be saved this item is monitored so that appropriate information can be provided to the customer according to the remaining lease period.