An object of the present invention is to reduce the workload of an operator who applies classification information necessary for estimating the operation know-how of a water supply plant to time-series data of measured values and control values. The operation know-how estimation device (1001) has a data acquisition unit (101) that acquires target time-series data, which is time-series data of measured values related to the state of a water plant and control values related to operation operations, and target time-series data for each section. The classification information addition unit (102,106) that classifies the data according to the clustering algorithm and assigns the classification information to the section of the target time series data, and calculates the conditional probability that the measured value and the control value are simultaneously established for each classification information. Creates a know-how estimation unit (103) that estimates operational know-how that represents control values to be set for measured values based on conditional probabilities, and display information that supports status recognition or operation of water plants based on operational know-how. A display control unit (104) to be displayed on the display unit (105) is provided.
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