Abstract: A casualty insurance service system for a specific computer and related equipment is provided, in which a maintenance contract regarding the computer or related equipment is adopted as an insurance contract, and service for the insurance contract is at least broken down to a client insurance service offered on a remote site and an on-site insurance service so that the next premium can be reduced when there is no fault in the period of insurance and a casualty insurance premium can be levied when there is a fault. The premium for each insurance service is determined by assessment determination means.