An object is to provide a novel data processing system. The data processing system includes a portable terminal, a network, a server, and a database. The portable terminal transmits position information to the server through the network. The server transmits, to the portable terminal through the network, a plurality of pieces of object data corresponding to the position information obtained from the database. Imaging data obtained by the portable terminal and the plurality of pieces of object data are compared, and when there is a piece of the object data that does not match the imaging data, the mismatched piece of the object data stored in the database is updated.