PURPOSE: To obtain a data control device capable of easily recognizing the data number of operation data to be retrieved.
CONSTITUTION: This data control device is provided with a data preservation processing means 4 preserving the operation data read by a process input means 3 in an operation history data base 5, a data number retrieving means 10 retrieving a data number based on the keywords of the data classification, data attribute and data name from a data number data base 6 where the data number, data classification, data attribute, data name, unit of the operation data read by the process input means 3 are preserved, a retrieval condition setting means 8 setting the retrieving condition of a data number to be retrieved by the data number retrieving means 10 and a retrieval result display means displaying the result retrieved by the retrieving condition.