A wearable device and method therefor. The wearable device comprises a processing unit, a storage unit, a positioning unit, a sensing unit, a communication unit, a power supply unit, a vibrator, a camera, a microphone, a loudspeaker and an emergency press key. The device detects the geographic location, body posture, and movepeoplet state, measures the forces applied on the device, and determines, on the basis of the comparison of the inclination angle value, acceleration value, and duration with corresponding thresholds in combination with the positive/negative signs of the duration and acceleration value, whether the device user is in the normal, abnormal or dangerous state. In case of the abnormal or dangerous state, different alert signals transmitted rescue cell phone and audiovisual communication can be enabled with the rescue cell phone, such that the device user can obtain help as soon as possible in different accidents.