[Problem] The purpose of the present invention is to provide a computer system, a teaching data trading method, and a program that enable teaching data used in machine learning to be traded. [Solution] A computer system for trading teaching data used in machine learning receives from a lister an input of teaching data to be listed, receives from a purchaser a search for teaching data the purchaser wishes to purchase, and receives from the purchaser a purchase of the preferred teaching data. In addition, the computer system receives a search that is based on any among the data type, data volume, data content, or programming language of the teaching data the purchaser wishes to purchase or based on a combination of a plurality of the same. Additionally, the computer system carries out machine learning using the teaching data for which the purchase was received and provides the results of the machine learning to the purchaser. An input of the listing price for the listed teaching data is received from the lister. The compatibility between the sensor device used by the purchaser and the teaching data the purchaser wishes to purchase is presented. A sensor device having excellent compatibility with the purchased teaching data is presented.