GRACE system developed by numerical physics group in KEK has been used to generate Feynman diagrams and to calculate cross sections automatically up to one-loop level. It can also generate multi-loop diagrams in the standard model. There exist several attempts to make analytical evaluation of Feynman integrals of multi-loop diagrams. We shall, however, reach to the limit in this direction sooner or later. A new approach to the numerical evaluation of multi-loop integrals is introduced.