In recent years, the demand for object-oriented programming languages has been increasing year by year, and learning an object-oriented programming language is considered to be an indispensable concept for programming. In conventional systems, there was no learning system specialized in object-oriented programming that could display appropriate advice according to the result. Therefore, this study focused on learning an object-oriented programming language. We have increased the content of object-oriented programming with color-themed questions, and made it possible to display advice according to the answer results, making the system suitable for beginners. From the results of the evaluation experiment, it was confirmed that the usefulness of the system and the learning content were substantial.