In accordance with a program, a processor obtains a plurality of manufacturing parameters and a measured value of an at least one property of an alloy material, calculates a pre-predicted value based on a first manufacturing parameter included in the plurality of manufacturing parameters using a prediction expression describing a relationship between the first manufacturing parameter, and a pre-predicted value of the property representing a roughly calculated value of a target predicted value that is a target value of the property, calculates a difference between the pre-predicted value and a measured value of the property, and trains a model using a training data set including a second manufacturing parameter and the difference, to generate a trained model that is used to predict the at least one property.