3. The method of claim 1 , wherein computing the estimated value of the correlation between the plurality of annotations includes computing the estimated value of the correlation using a formula for computation in which deviation from a reference value of the correlation between the first plurality of annotations and the second plurality of annotations increase in value as a second representative value in the plurality of first representative values increase in value.
3. The method of claim 1 , wherein computing the estimated value of the correlation between the plurality of annotations includes computing the estimated value of the correlation using a formula for computation in which deviation from a reference value of the correlation between the first plurality of annotations and the second plurality of annotations increase in value as a second representative value in the plurality of first representative values increase in value. 4. The method of claim 3 , wherein, in the computation of the estimated value of the correlation, the formula includes a term divided by an expression for subtracting a third representative value in the plurality of first representative values from a fourth representative value of a confidence level in the plurality of second confidence levels, and the computing unit increases a value that the expression evaluates.