1. A text processing apparatus for performing an analysis process by contrasting a first text set constituted by first texts and a second text set constituted by second texts corresponding to the first texts, the first texts and the second texts corresponding thereto being generated around a same event through mutually different generation processes, the text processing apparatus comprising: a segment determination unit; and a descriptive content determination unit, wherein the segment determination unit determines, with respect to a homogeneous segment that is similar to a plurality of segments constituting a first text which is set as an analysis target and that is included in another first text, whether a content thereof is included in the second texts, and the descriptive content determination unit determines, based on a result of the determination by the segment determination unit, whether each segment constituting the first text which is set as the analysis target should be described in the second text corresponding to the first text which is set as the analysis target.