In the process of learning piano, interest in learning decreases due to lack of basic skills or difficulty in reading sheet music, and eventually quit. It was confirmed that the most important factors influencing the factor of abandonment were academic concentration and loss of interest in the piano learning process. Existing systems that help piano learning provide limited services to specific platforms, and the use of equipment such as HMD(Head-Mounted Display) is sometimes forced. In this paper, a piano practice system was developed so that services can be used on multiple platforms, free from platform restrictions. By storing the user's practice information on the server, it was possible to induce interest through competition between users, and it was developed to enable more immersive practice using HMD.