A process monitoring system comprising: a field device located in a plant and configured to measure a state quantity; a storage unit configured to store data based on the measured state quantity output from the field device as time-sequence data, and events/history of operations as log data; a prediction unit configured to perform a first simulation to predict a time variation of the state quantity based on immediately previous time-sequence data and to judge whether or not an abnormality will occur in a future; a display unit configured to display a result of the first simulation as a trend graph; and an extraction unit wherein, if the prediction unit judges that an abnormality will occur in a future, then the extraction unit is configured to extract: time-sequence data similar to the first simulation result from the time-sequence data stored in the storage unit; log data of the period of time, in which the extracted time-sequence data has been obtained, from the log data stored in the storage unit; and a handling procedure performed at the period of time, in which the extracted time-sequence data has been obtained, from the extracted log data; wherein the prediction unit is configured to perform a second simulation by using immediately previous time-sequence data and the handling procedure extracted by the extraction unit to predict a time variation of the state quantity in a case of performing operations included in the handling procedure. a field device located in a plant and configured to measure a state quantity; a storage unit configured to store data based on the measured state quantity output from the field device as time-sequence data, and events/history of operations as log data; a prediction unit configured to perform a first simulation to predict a time variation of the state quantity based on immediately previous time-sequence data and to judge whether or not an abnormality will occur in a future; a display unit configured to display a result of the first simulation as a trend graph; and an extraction unit wherein, if the prediction unit judges that an abnormality will occur in a future, then the extraction unit is configured to extract: time-sequence data similar to the first simulation result from the time-sequence data stored in the storage unit; log data of the period of time, in which the extracted time-sequence data has been obtained, from the log data stored in the storage unit; and a handling procedure performed at the period of time, in which the extracted time-sequence data has been obtained, from the extracted log data; wherein the prediction unit is configured to perform a second simulation by using immediately previous time-sequence data and the handling procedure extracted by the extraction unit to predict a time variation of the state quantity in a case of performing operations included in the handling procedure. time-sequence data similar to the first simulation result from the time-sequence data stored in the storage unit; log data of the period of time, in which the extracted time-sequence data has been obtained, from the log data stored in the storage unit; and a handling procedure performed at the period of time, in which the extracted time-sequence data has been obtained, from the extracted log data; wherein the prediction unit is configured to perform a second simulation by using immediately previous time-sequence data and the handling procedure extracted by the extraction unit to predict a time variation of the state quantity in a case of performing operations included in the handling procedure.