Information processing method and information processing system

An information processing system, comprising:

• an acquisition unit that obtains a piece of first data and a piece of second data, the piece of second data being not included in a training dataset used for training an inferencer;
• a computation unit (a) that calculates, by using a piece of first relevant data, a first contribution representing respective contributions of portions constituting the piece of first data to a piece of first output data output by inputting the piece of first data to the inferencer, the piece of first relevant data being obtained by inputting the piece of first data to the inferencer trained by machine training using the training dataset and (b) that calculates, by using a piece of second relevant data, a second contribution representing respective contributions of portions constituting the piece of second data to a piece of second output data output by inputting the piece of second data to the inferencer, the piece of second relevant data being obtained by inputting the piece of second data to the inferencer;
• and
• a determination unit that determines whether to add the piece of second data to the training dataset for the inferencer, according to a degree of similarity between the first contribution and the second contribution.