The utility model provides a pipeline update plan making supporting system and a pipeline update plan making supporting method. The making of the optimal pipeline update plan capable of minimizing the costs of the service lifetime of the pipeline can be supported. The pipeline update plan making supporting system(100) comprises a storage device (101), a calculating device (104), and an output device (106). The storage device (101) is used to store the cost estimation information (125) including the attribute information of the pipeline. The calculating device (104) is used to calculate the update introducing costs required by the update of the water distribution pipeline and the maintenance management costs of the water distribution pipeline caused by the water leakage of the water distribution pipeline according to the cost estimation information, is used to calculate the service lifetime cost of the water distribution pipeline according to the calculated update introducing costs and the maintenance management costs, and is used to calculate the minimal optical water distribution pipeline update period of the service lifetime. The output device (106) can be used to display the calculated update introducing costs, the calculated maintenance management costs, the service lifetime costs, and the information of update periods of the optimal water distribution pipeline.
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