Information processing system, method for controlling information processing system, control program, and recording medium

An information processing system comprising:

• an acquirer configured to acquire input information comprising a medical image showing an affected bone of a subject;
• an identifier comprising a first learning model trained using first training data, the first training data comprising bone information on at least any of a bone density and a bone quality of a bone before application of a surgical treatment method comprising an implant embedding procedure, a shape feature, and treatment information on a surgical treatment method applied to the bone, of each of a plurality of training subjects;
• and
• an outputter configured to output at least any of instrument information, prediction information, parameter information, and implant information each identified by the identifier based on the input information, the instrument information indicating a surgical instrument to be used in a surgical treatment method suitable for the affected bone of the subject, the prediction information indicating a prediction of a state of the affected bone of the subject after application of the surgical treatment method, the parameter information indicating a parameter selectable when the surgical treatment method is applied to the affected bone of the subject, and the implant information on an implant embeddable in the affected bone of the subject.