An electronic apparatus, system, and method for providing body posture health information are provided. The method includes the steps of: calculating a posture data cluster based on signals detected by an inertial sensor disposed on a human body; comparing the posture data cluster with a plurality of preset posture data clusters individually to determine whether the posture data cluster matches one of the preset posture data clusters; if it matches one of the preset posture data clusters, generating a feedback message; calculating a plurality of muscle status indexes based on signals detected by electromyography sensors disposed on the human body; comparing the muscle status indexes with corresponding preset muscle status indexes individually to determine whether one of the muscle status indexes is abnormal; providing suggestion information in response to at least one of the muscle status indexes being abnormal; and displaying a multimedia corresponding to the suggestion information.