To provide an effective and common state identification method for monitoring and diagnosing various facilities, in consideration of reflecting the characteristic of the state of the facility reflected by the histogram of the time domain and frequency region of a measurement signal in order to effectively perform state identification and pattern recognition, for example, facility state monitoring and abnormality diagnosis.SOLUTION: A state identification method comprises a step in which a signal of an object is collected at a predetermined measurement frequency and a measurement time in a method for state diagnosis and pattern recognition; a step of obtaining waveform data of a signal; and a step of obtaining a histogram of the time domain or frequency region of the waveform data; and a step of integrating a segment value of the histogram by a multivariate analysis method and a technique of artificial intelligence and performing a state identification and a pattern recognition of the object. By using at least one of histograms in the time domain and histogram in the frequency domain, the histogram segment values are combined by a multivariate analysis method and a technique of artificial intelligence, and the state identification and pattern recognition of the object are carried out.SELECTED DRAWING: Figure 5
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