Abstract: The present invention relates to a method and apparatus for analyzing functionality and test paths of product line using a priority graph. The apparatus includes: a parser for analyzing a use case scenario expressed in a text format, in a unit of word to separate a word from the analyzed use case scenario; an object/behavior identifier for extracting core noun and verb from the separated word; a dependency graph modeler for supporting to model an execution flow of a function; a priority graph editor for supporting to analyze and express linked feature objects, a feature category, a default value, a reference value, a use case name, variation points; a test path identifier for identifying a test path to examine requirements and plan a test at an information expression of a priority graph; and a graphic information processor for visually changing and showing an analysis information of the dependency graph and the priority graph.