A data storage control system includes an expression-format changing device for changing applied data to data having a prescribed expression format, a storage device for storing data readably, a storage controller for accessing the storage device and reading data that has been stored in the storage device or writing data, the expression format of which has been change by the expression-format changing device, to the storage device in accordance with an applied read/write command, and a command execution device, to which an applied command is entered, for applying a read/write command to the storage controller in accordance with the entered command.