NTT Data Corp. said Tuesday it has reached a tieup agreement with Cap Gemini S.A. of France, and as part of the accord it will buy a 95 percent stake in the Japanese unit of the French computer consultancy for about 4 billion yen.

NTT Data, which engages in the system integration business, expects the tieup with the world's fifth-largest information technology services company to help reinforce its services for Japanese companies operating overseas.

In the domestic market, it expects the acquisition of Capgemini Japan K.K. to help expand its services and customer base.