1. A control model updating device for calculating and updating a control model to control an apparatus, the control model being an approximate function, and the control model being calculated using analysis data that is provided in order to update the control model, the control model updating device comprising: a control model calculating unit calculating the control model using the analysis data; a control model updating unit updating through accepting a control model calculated by the control model calculating unit; and a data suitability evaluating unit evaluating the suitability of the analysis data, wherein the data suitability evaluating unit comprises: a characteristic prior knowledge storing unit storing prior knowledge regarding characteristics obtained in advance regarding the apparatus to be controlled; a quadratic polynomial calculating unit calculating a quadratic polynomial that approximates the analysis data using a quadratic function; and a characteristic evaluating unit comparing the characteristics of the quadratic polynomial, calculated by the quadratic polynomial calculating unit, to the prior knowledge stored in the characteristic prior knowledge storing unit, and wherein the control model updating unit updates the control model when there is a match between the two in the comparison in the characteristic evaluating unit.