Make it possible to modify the application of the software while continuing the operation of the system even in a cluster system to perform the job with high processing load. Modify data (3) is input, modification application scheduled node determining means by (1b), is generated (1c) modification application scheduled node list. In addition, the modification applicable node selection means by (1e), the value of (1f) until it reaches the predetermined upper limit value modification-in-progress node counter that indicates the number of nodes of the modification-in-progress, the job from the modification application scheduled node list It is a modification applicable Node ID Node ID of the node that is not operation is sequentially extracted. And, service management unit by (1g), the operation of the modification application nodes corresponding to the modification applicable node ID is stopped, modified means by (1h), fix target based on modified data to the modification application node that has stopped operation modification of the software is carried out.
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