A semiconductor memory device provided with a data input portion for receiving 1 page's worth of data, dividing it to a plurality of code words, generating and adding check code (parity data) for each code word, successively forming main code words and transferring the same to a bank (A) or a bank (B), and a data output portion for receiving 1 page's worth of data including main code words transferred from the data latch circuit, correcting the error data when there is within a predetermined number of error data for each main code word, adding the error information for read each read code word except check code (parity data), and transferring the same to a host side, and a signal processing system using the same.