The system for managing materials comprises: a material yard which has a material carry-in port and a material carry-out port, the material yard being divided into a plurality of yard sections which store materials; a plurality of first tags which record data of the materials to be read in a non-contact manner, the first tags being attached to the materials managed in the material yard; a second tag which stores and sends data of an identification ID issued for each of lots into which the materials are classified to check a current position of each of the lots via a position sensing signal transmitted to the material yard, the second tag being attached to each of the lots; a reading device which reads the data recorded in the first tags, the reading device being provided in at least one of the material carry-in port and the material carry-out port within the material yard; a plurality of receiving devices which receive a data signal of the identification ID transmitted from the second tag, the receiving devices being respectively provided in the yard sections; a plurality of transmitting devices which transmit the position sensing signal received from the second tag to check the current position of the second tag, the transmitting devices being provided on each of a plurality of predetermined positions in the material yard; and a database which records the data of the materials and management data for managing the materials so as to manage the materials.