An example system includes: a contactless communication part that performs contactless communication with a data storage medium having a contactless communication function; a data writing part that writes data to the data storage medium by the contactless communication part; a storage part that stores the data written by the data writing part; and a corruption determination part that determines whether the data stored in the data storage medium is corrupted or not. When the corruption determination part determines that the data is corrupted, the data writing part writes the data stored in the storage part, to the data storage medium.