1. A method of detecting stress of an integrated circuit including first and second patterns formed from different materials, the method comprising: determining one or more stress detection points of the first pattern; dividing a region including a first stress detection point of the one or more stress detection points into a plurality of divided regions; calculating areas of the second pattern at the divided regions; and detecting a stress level applied to the first stress detection point of the first pattern by the second pattern based on the areas of the second pattern at the divided regions.