When an initializing operation starts, a busy state indicative of the disenable of access operation is set (S11), and read operation information is read out by preferentially using a verify sense amplifier 4 or a high-speed read sense amplifier 3 (S12). Upon completion of latching the read operation information (S13: Y), a ready state that announces that the read access operation from a non-redundant memory region is enabled is set (S14), and a ready signal is outputted according to an external read access request to the non-redundant memory region. A boot program or the like which is in the non-redundant memory region can be read out in parallel with the read of the operation information. Subsequently, the redundancy information is read out (S15), and a ready state that announces that the read access operation from all of the memory regions is enabled is set upon completion of reading out the redundancy information (S17). Thereafter, rewrite operation information is read out (S18). The period of time since the start of the initializing operation to the start of the read access operation can thereby be reduced.