A nonvolatile memory apparatus includes a memory device having a configuration information storage block for storing a first configuration data group and a second configuration data group having fewer bits than the first configuration data group and a configuration information processing circuit configured to determine a majority of the first configuration data group outputted from the memory device, during a first period of a power-up operation, and determine a majority of the second configuration data group outputted from the memory device, during a second period after the first period.