Entry-level digital EEG instrument was launched at 2008 after that the digital EEG instrument was first introduced in the early 1990s. Because of cheaper EEG, many studies have been attempted using it. Among them, Special purpose serious games are getting heightened interest. Special purpose serious game is giving fun and meaningful knowledge simultaneously. This paper proposes acquiring EEG from EEG instrument, noise cancellation/separation of waves through FFT/analysis/concentrations calculation, HTML 5 game implementation/Client server design and sending of game result to user's browsers. Through this we suggests that the method in which performs efficient design and implementation of Network-based serious game using EEG. Future work includes that user can perform piano ensemble using network to draw user's fun and concentration. And experimental will be performed in piano school to prove that the students who have used our system before lesson shows great learning ability than the others.