Memory module groups are provided which include a memory module, which includes memory chips. In the case in which an error chip that is a memory chip that is provided with an error is in a first memory module, a first memory module group that is provided with the error chip is not managed as a memory module group that cannot be used even if an error of the first data element is mis-corrected based on the error detecting code of the first kind. In the case in which an error chip is in a second memory module, a second memory module group that is provided with the error chip is not managed as a memory module group that cannot be used in such a manner that an error of the second data element is not mis-corrected based on the error detecting code of the second kind.