A method for ameliorating an insomnia of a user having a brain wave includes steps of defining a specific frequency range of 8 to 12 Hz as a μ rhythm in the brain wave, detecting a total power under the specific frequency as a μ rhythm intensity of the user, providing one of an animation and a wave form representative of the μ rhythm intensity of the user, and inducing the μ rhythm of the user by watching one of the animation and the wave form by the user.
