By calculating the utility function value (Utility value) by using the utility function (Utility function), through service-level standardization between different infrastructure facilities, and evaluating the quantitative quality of service, and thus to determine the maintenance priority, Society there is provided a cross-asset management decision support system based facilities. Determined cross-asset management doctors in community-based facilities, systems, depending on your valuable items prescribed for each of the selected two kinds of community-based facilities set up the service levels (LOS) and performance indicators (PM), and set performance indicators, each of the utility function and and calculating a performance index by the utility function value, in response to the calculated performance index-specific utility function, the value normalized with the respective service level score, as compared to a normalized level of service score evaluation each service level (LOS) by the weight Multi-asset management systems; And cross (Cross) Asset Management decision to prioritize comparing the service level evaluation result evaluated by the plurality of asset management systems, respectively to support the crystal cross each other, and to maintain the high infrastructure facility service level assessment first maintenance comprising a cross-asset management decision-making, wherein a plurality of service-level asset management system, each of the service level between different community-based facilities, standardization being in response to the performance indicators by the utility function values ​​normalized to each of the service level score do.