PROBLEM TO BE SOLVED: To provide an importance calculation device, an importance calculation method, and an importance calculation system, which estimate an important attribute of an unknown object on the basis of a correlation between information of a known object and related information of the known object.SOLUTION: An importance calculation device comprises: a data processing unit that performs predetermined processing on a first information group, of information groups composed of a plurality of attributes, in which a predetermined attribute is set to a predetermined value and on a second information group composed of input queries, and calculates an estimation score; and a calculation unit for calculating the importance of the predetermined attribute in the queries on the basis of similarity between the estimation score and a target score.
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