A data evaluation system includes: an acquisition unit that acquires, as training data, data including information representing an emotion of a user and classification information for classifying the emotion an emotion evaluation unit that determines a degree indicating how much a data element included in the training data reflects the users emotion, as emotion evaluation information, on the basis of the classification information a storage unit that associates the data element with the emotion evaluation information determined for the data element and stores them in a memory unit and an unknown data evaluation unit that evaluates an emotion of a user who has created unknown data, on the basis of the emotion evaluation information stored in the memory unit when new data is acquired as the unknown data.
