1. A text mining device, comprising: an element identification units which calculates a feature degree that is an index for indicating a degree to which an element of a text appears within the text set of interest as a set of text that is to be analyzed, and corrects the feature degree on the basis of a topic relatedness degree that is a value indicating a degree which relates the analysis target topic as a topic for which each part of text which is divided analysis target text into predetermined units targets for analysis when calculating the feature degree, and an output unit which identifies a distinctive element within the text set of interest on the basis of the feature degree and outputting the identified element.