An event analysis device having an event collector for collecting event log data representing an operation history by a DCS operator; an event analyzer for analyzing the event log data, and extracting basic unit operations or unit operations representing an operation method based on operations of the DCS operator or an operation intention based on operations of the DCS operator; an operation sequence extractor for extracting operation sequences which the basic unit operations or the unit operations are aligned in accordance with time order in every service time period; an operation clusterer for clustering the operation sequences based on similarity among the operation sequences extracted in every service time period; and an operation procedure generator for analyzing the operation sequences clustered in same type, and estimating a structure of the operation procedure based on the operation of the DCS operator.

An event analysis device includes an event collector configured to collect event log data which represents operation history of a DCS operator; an event analyzer configured to analyze event log data collected by the event collector to extract analysis result data representing operation method based on the operation of the DCS operator or analysis result data representing operation intention based on the operation of the DCS operator; an operation sequence extractor configured to extract analysis result data respectively in every period in specified multiple periods and extract operation sequence sorting analysis result data based on operation time; and an operation sequence clusterer configured to cluster the operation sequence based on the degree of the similarity between the operation sequences which are different from each other.