ACR MLG FRT ACFT LANDED ON AN OCCUPIED RWY AT NIGHT AT A NON TWR ARPT.

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FLT WAS CLRED FOR APCH ILS TO RWY 22 AT ILN BY DAYTON APCH CTL AND TOLD TO 'CONTACT ADVISORY'. MY FLT ROGERED THE CLRNC AND CALLED AIRBORNE UNICOM AND RPTED 'AIRBO INBOUND RWY 22 WILMINGTON.' THE FLT WAS GIVEN LCL ALTIMETER AND WIND FROM AIRBORNE TWR. WHEN MY FLT LANDED MY FO AND I NOTICED AN HVT TURNING OFF AT THE FAR END OF THE 10700 FT RWY. NEITHER OF US SAW THE AIRPLANE ON THE RWY DURING LNDG; DUE TO THE TAIL LIGHT OF THE HVT BLENDING IN WITH THE CENTERLINE LIGHTS; UNTIL THE HVT TURNED SIDEWAYS TO US AND HE WAS TURNING OFF THE FAR END OF THE RWY. THE 'ADVISORY TWR' DID NOT MENTION THE HVT WAS STILL ON THE RWY WHEN WE MADE CONTACT WITH THEM AT THE AIRBO OM. PRIOR TO REACHING AIRBO WE DID HEAR THE HVT CANCEL HIS IFR FLT PLAN WITH DAYTON APCH. WHEN I QUESTIONED THE ADVISORY ABOUT THE HVT BEING ON THE RWY AND TELLING ADVISORY I DIDN'T KNOW THE HVT WAS STILL ON THE RWY OR SEE IT UNTIL IT TURNED OFF; I WAS TOLD 'THEY WERE ONLY AN 'ADVISORY' AND THEY DIDN'T SEE THE HVT ON THE RWY EITHER.' CONTRIBUTING FACTORS WERE: I HEARD THE HVT CANCEL HIS IFR WITH DAYTON APCH WHEN I WAS MORE THAN 7 MI FROM TOUCHDOWN. IN THE TIME FRAME OF BEING CLRED FOR THE ILS APCH BY DAYTON APCH AND CONTACTING AIRBORNE ADVISORY AT AIRBO INBOUND I FIGURED THE HVT WOULD HAVE BEEN OFF THE RWY. NOTHING WAS SAID TO MAKE ME THINK OTHERWISE. FROM NOW ON I WILL ASK ADVISORY IF THE RWY IS CLRED.