Patent attributes
Business rule statements written in a natural language are automatically converted into DRL language sentences. A language conversion apparatus 10 includes: a storage device 16 that stores syntax definition information 30 for defining syntaxes to convert a business rule statement written in a natural language into a DRL language sentence on a syntax basis, and conversion information 40 for converting element variables of the business rule statement into element variables of the DRL language sentence; and a CPU 11 that analyzes a syntax of the business rule statement by comparing the business rule statement with the syntax definition information 30 and converts the business rule statement into the DRL language sentence by referring to the conversion information 40.