To increase the amount of information to be utilized.SOLUTION: An
information processing system includes an
information processing apparatus, a first terminal device that holds first user characteristic information, and a second terminal device that holds second user characteristic information. The
information processing apparatus includes: an information collection unit which collects, from the first terminal device, first anonymized information generated by anonymizing the first user characteristic information, and collects, from the second terminal device, second anonymized information generated by anonymizing the second user characteristic information; a
learning unit which generates a model configured to learn, by
machine learning, a relationship between the first user characteristic information and the second user characteristic information, using the first anonymized information and the second anonymized information, as
learning data, and output, on
receipt of the first user characteristic information, estimated user characteristic information estimated from the relationship between the first user characteristic information and the second user characteristic information; and a model output unit which outputs the model to the first terminal device.SELECTED DRAWING: Figure 3