PURPOSE: To display kinds and the quantities of oil to be loaded into a tank lorry previous to supplying.

CONSTITUTION: A main computer 10 checks the quantities and kinds of oil which can be loaded into a tank lorry in correspondence with an identification code of a card, and sends the data to an input-output unit 11. The input-output unit 11 displays the data of the total quantity of oil supplying, a guide quantity of supplying = XX', and a specified kind of oil on a display 14, respectively. Workmen sequentially input the quantities of oil supplying for one tank by each divided tank from a ten key 13. After that, every time oil supplying to each divided tank starts, kinds of oil and the quantities of oil supplying are sequentially displayed on a display 18.