An electronic apparatus and an operating method are provided. The electronic apparatus includes a motion sensor, an optical sensor, a memory, and a processor. The processor determines whether the electronic apparatus is worn on a user's body using at least one of the motion sensor and the optical sensor. The processor obtains sensor data according to a motion of the electronic apparatus using at least one of the motion sensor and the optical sensor when determining whether the electronic apparatus is worn on the user's body. In addition, the processor compares the obtained data with at least one reference information stored in the memory, determines whether the electronic apparatus is normally worn based on the comparison, and performs at least one operation based on the determination.
