A data analysis unit outputs a plurality of the analytical results by performing various analyses on analytical data concerning a set of analytical objects from different viewpoints and different grading for re-arrangement and systematization of analytical objects. In a knowledge storage unit, the information expressing the background knowledge which can be utilized by the user is stored for each analytical object beforehand. An analytical result selection unit analyzes relationships between the analytical results output from the data analysis unit and the information stored in the knowledge storage unit, selects those results which have a high consistency with the background knowledge, and presents the selected analytical results to the user.