7. The text processing apparatus according to claim 3 , wherein the descriptive content determination unit derives, as the extent of inclusion in the second text, a frequency at which the content of the homogeneous segment is described in the second text corresponding to the other first text which includes the homogeneous segment, further derives a degree to which 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, such that the degree increases the higher the frequency, and performs the determination using the derived degree.
3. The text processing apparatus according to claim 2 , wherein the descriptive content determination unit derives, based on the result of the determination by the segment determination unit, an extent to which the content of the homogeneous segment is included in the second text corresponding to the other first text which includes the homogeneous segment, further derives, based on the derived extent, a degree to which 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, and performs the determination using the degree.