To provide a learning data construction support device efficiently constructing learning data necessary for automatically classifying electronized information groups.

This learning data construction support device is provided with information source storage means 1 storing the information groups of the information source, category hierarchy means 2 storing classification category hierarchy, classification learning data storage means 3 storing information ID groups of the pertaining information groups for every classification category, approximate classification means 4 selecting an information-category pair to be a first approximate of the learning data from the information groups of the information source storage means and storing it in the classification learning data storage means, category exclusion means 5 deleting the information groups extending over multiple categories from the respective pertaining categories and securing the extrusion of the content between the classification categories, output means 7 displaying the state of the support device to a user, input means 8 inputting the selection and the demand of the user, and control means controlling the respective means.