The present invention is capable of automatically changing resource allocation based on a result of measurement of performance information conforming to the service level objective corresponding to various kinds of applications. For the change of resource allocation, in accordance with a generated resource allocation changing rules and the structure information, the present invention comprises: a performance measurement item template to generate a measurement item of the performance information from the structure information by storing a resource table including a server, network, and storage, an application table indicating structural elements of applications operating on these resources, and an allocation table to applications of resources; a performance measurement engine for measuring the measurement item of this performance information with the performance measurement engine; and a means for generating resource allocation changing rules used for resource allocation change from the structure information.