It is presented as a candidate can be selected by the user, and prompts the user to select candidate user, and SLO group that accepts a request from a user values for each SLO desired, to satisfy the required value, the SLO group to satisfy as much as possible the required value by, to be able to determine its value and SLO in the system to be built to provide a service to the user. Service Level item management system, from the administrator, group name SLO name, group of SLO, SLO SLO name of belonging to the group and SLO is input a hierarchical relationship, such as target value, the SLO group. In addition, SLO name to be specified by the user from the user terminal and I receive a request value for the SLO. Each combination of SLO group up to the lowest group SLO SLO from the top-level group, combination specifying means 94 calculates the degree to which target value satisfies the required value.
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