We adopted the B3 Band shown in Figure 1, which is one of the simple electroencephalographs produced by B-Bridge International, Inc. The size is 54 mm (L) × 25 mm (W) × 17 mm (H), and the weight is approximately 100 g. The band is so small that it is not uncomfortable to wear during the exercise. The right side of Figure 1 shows an example of a user wearing the B3 Band. There is an electrode on the left ear hook, and two other electrodes are attached to the forehead of the band. The brain-waves data are measured through those electrodes and sent to tablets or PCs by Bluetooth communication. We can check the data in real time on a tablet using the attached software. We can also develop applications using PC development kits.