Data analysis system, method for controlling data analysis system, and recording medium

A data analysis system that analyzes data to generate information on a tendency of a user, the data analysis system comprising:

• a memory that stores at least temporarily a plurality of evaluation data to be analyzed;
• and
• a controller that evaluates each of the plurality of evaluation data based on training data and generates grading information of the plurality of evaluation data,
• wherein after the controller generates the grading information of the plurality of evaluation data, the controller further:
• extracts a part of the plurality of evaluation data as first information from the plurality of evaluation data based on the grading information of the plurality of evaluation data, wherein the plurality of evaluation data have not been classified by the user as related data,
• extracts a characteristic pattern from the first information,
• extracts a part of the training data, which includes the characteristic pattern included in the first information, as second information from the training data,
• wherein the training data have been classified by the user as the related data, and
• generates a reason sentence by applying the first information and the second information to a format, and
• displays the reason sentence with a recommended product or service.