Prediction model conversion method and prediction model conversion system

A prediction model conversion system, comprising:

• a prediction model converter that converts a prediction model by converting at least one parameter which is included in the prediction model and is for performing homogenization processing into at least one parameter for performing processing including nonlinear processing, the prediction model being a neural network;
• and
• a prediction model encryptor that generates an encrypted prediction model that performs prediction processing with input in a secret state remaining secret by encrypting the prediction model that has been converted.