A method of operating an electronic device, the method comprising: obtaining first state information related to first motion of the electronic device by using a first sensor operatively coupled to the electronic device while the electronic device is in a first state; transitioning (813, 815) if the first state information satisfies a first designated condition, the electronic device from the first state to a second state, wherein if a value for the first motion above a specific value is maintained for a set time, the first state information satisfies the first designated condition; obtaining (817, 911, 1211) second state information related to second motion of the electronic device by using the first sensor while the electronic device is in the second state; determining whether the second motion corresponds to a set motion (913, 1213); if the second motion corresponds to the set motion, activating (915, 1215) a second sensor; obtaining (819, 917, 1217) third state information related to at least a part of a user's body corresponding to the electronic device by using the second sensor operatively coupled to the electronic device while the electronic device is in the second state; and transitioning (821, 919, 1219), if the third state information satisfies a second designated condition, the electronic device from the second state to a third state, wherein the first state is a state in which the electronic device is not carried by the user, wherein the second state is a state in which the electronic device is carried by the user, wherein the third state is a state in which the electronic device is worn by the user, and wherein the first sensor consumes less power than the second sensor. obtaining first state information related to first motion of the electronic device by using a first sensor operatively coupled to the electronic device while the electronic device is in a first state; transitioning (813, 815) if the first state information satisfies a first designated condition, the electronic device from the first state to a second state, wherein if a value for the first motion above a specific value is maintained for a set time, the first state information satisfies the first designated condition; obtaining (817, 911, 1211) second state information related to second motion of the electronic device by using the first sensor while the electronic device is in the second state; determining whether the second motion corresponds to a set motion (913, 1213); if the second motion corresponds to the set motion, activating (915, 1215) a second sensor; obtaining (819, 917, 1217) third state information related to at least a part of a user's body corresponding to the electronic device by using the second sensor operatively coupled to the electronic device while the electronic device is in the second state; and transitioning (821, 919, 1219), if the third state information satisfies a second designated condition, the electronic device from the second state to a third state, wherein the first state is a state in which the electronic device is not carried by the user, wherein the second state is a state in which the electronic device is carried by the user, wherein the third state is a state in which the electronic device is worn by the user, and wherein the first sensor consumes less power than the second sensor.