The classification device extracts a plurality of concatenated character strings in which words obtained by dividing text data into words are concatenated. The classification device refers to a storage unit that stores a classification category in which each of the plurality of text data including the text data is classified for each of the plurality of concatenated character strings, and among the plurality of text data, the text including the concatenated character string. Calculate the distribution of the data classification destination. The classification device selects a feature word from a plurality of concatenated character strings based on the distribution of the classification destination, and generates a classification rule in which the classification category in which the text data is classified and the feature word are associated with each other.
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