Abstract: An unsafe location enumeration unit (131) enumerates, based on a code of a program, locations that do not satisfy a predetermined condition indicating that type conversion is safe among locations where a type casting occurs in the program. A context extraction unit (132) transition an automaton corresponding to the locations enumerated by the unsafe location enumeration unit (131) and extract a context reaching the locations. A vulnerability verification unit (133) verifies whether the location extracted by the context extraction unit (132) satisfies an annotation prepared in advance.

Abstract: A calculating unit calculates a semantics set relating to an entirety of state of a recursive neural network satisfying a specification. A determining unit determines whether or not the recursive neural network that is an object of checking satisfies the specification, on the basis of the semantics set and an initial state of the recursive neural network that is the object of checking.