Signal analyzing apparatus, signal analyzing method, and computer program

Provided are a signal analyzing apparatus, a signal analyzing method and a computer program wherein an analysis that excludes the subjective of a user can be done and the performance of the analysis can be adjusted. A signal analyzing apparatus (1) generates an intensity distribution of a plurality of particular signals from a spectrum distribution on two-dimensional coordinates measured by a measuring device (3) of an EDX apparatus or the like, and classifies n-dimensional coordinate points on an n-dimensional space, which is defined by a combination of the intensities of n particular signals, into a plurality of clusters by use of an EM algorithm. Further, the signal analyzing apparatus (1) determines the points on the two-dimensional coordinates corresponding to the n-dimensional coordinate points included in each cluster, thereby generating the distribution of a respective spectrum having a respective different shape. The distribution of each spectrum having the respective different shape represents the distribution of material components that generates the spectrum having the respective shape. Thus, an analysis that excludes the subjective of a user can be done by use of the EM algorithm, and particular signals to be used for the analysis are selected, thereby allowing the performance of the analysis to be adjusted.