PROBLEM TO BE SOLVED: To make it possible to learn a model for appropriately creating a text for explaining a document.SOLUTION: A document for learning division part 22 divides a document for learning that is each of documents in a set of documents for learning to form a document for learning component series that is a series of document for learning components that are components of the divided document for learning. A document component labeling part 24 provides a document for learning component label that is a label indicating the importance of the document for learning component to each of the document for learning components forming the document for learning component series, while referring to a corresponding explanatory text in a set of explanatory texts for learning. An explanatory text creation model leaning part 26 leans, as an explanatory text creation model, a model for predicting the document for learning component label series from the document for learning component series, by using the document for learning component series and a plurality of document for learning component label series that are each a series of the document for learning component labels corresponding to the document for learning component series.SELECTED DRAWING: Figure 1
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