Provided are a risk calculation method for a computer network that enables a proper risk evaluation to be obtained for a network, and an insurance provision method using the risk calculation method, as well as a value evaluation method that can objectively evaluate the value of a computer network, and an investment value evaluation method for a computer network using the value evaluation method. Management information base (MIB) information in a computer network is acquired, the transition of the acquired MIB information is recorded, information on risks of halt of computer units or lines is extracted from the recorded transition information of the MIB information, the capability of a network is evaluated, the record of the state of maintenance/inspection of the network is inputted, the level of maintenance management is evaluated from the record, and a value at risk where the units or lines come to a halt is calculated from the evaluation of the network capability and from the evaluation of the level of maintenance management. The MIB information in a computer network is acquired, information on the activity ratio of a network and on the amount of data to be transmitted to the network is extracted from the acquired MIB information, the transitions thereof are recorded, future transition values of the activity ratio of the network and of the amount of data transmission are calculated from the recorded transition information, and the degree of customer's satisfaction with the network service company and of end-user using the service, is evaluated based on the calculated future transition values.
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