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The theory of inflation will be investigated as well as supersymmetrybreaking in the context of supergravity, incorporating the target-space dualityand the nonperturbative gaugino condensation in the hidden sector. We found aninflationary trajectory of a dilaton field and a condensate field which breakssupersymmetry at once. The model satisfies the slow-roll condition which solvesthe eta-problem. When the particle rolls down along the minimized trajectory ofthe potential V(S,Y) at a duality invariant point of T=1, we can obtain thee-fold value \sim 57. And then the cosmological parameters obtained from ourmodel well match the recent WMAP data combined with other experiments. Thisobservation suggests one to consider the string-inspired supergravity as afundamental theory of the evolution of the universe as well as the particletheory.Comment: 10 pages, 4 eps figures. Typos and references corrected. Final  version to appear in Mod. Phys. Lett.

DILATONIC INFLATION AND SUSY BREAKING IN STRING-INSPIRED SUPERGRAVITY