The prediction model evaluation means 81 evaluates the proximity of the properties of the prediction model after re-learning and the prediction model before re-learning. The prediction model updating means 82 updates the prediction model before the re-learning in the re-learned prediction model when the proximity of the property satisfies the proximity prescribed by the predetermined condition. At this time, the prediction model evaluating means 81 evaluates the proximity of the prediction result or the structural proximity as the proximity of the property of the prediction model.
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