There is provided a non-volatile memory having electrically rewritable non-volatile memory cells arranged therein. A controller controls operation at the non-volatile memory. The non-volatile memory comprises a status output section configured to output status information indicating a status of read operation, write operation or erase operation in the non-volatile memory cell. The controller comprises a control signal generating section configured to output a control signal for a certain operation in the non-volatile memory, and a control signal switching section configured to instruct the control signal generating section to switch the control signal based on the status information.