A smart watch comprising: a display unit configured to display content; a communication unit configured to transmit and receive data; a sensor unit configured to detect an input signal to the smart watch and transmit the detected input signal to a processor, wherein the processor is configured to: control the display unit, the communication unit, and the sensor unit, perform pairing between the smart watch and an external digital device using the communication unit, detect a take-off signal in a worn mode of the smart watch, wherein the take-off signal is a signal indicating that the smart watch is separated from a user, and switch the smart watch to an unworn mode in response to the detected take-off signal, characterized in that, in the unworn mode, the processor is further configured to: provide a notification indicating at least one event that is scheduled to occur in the smart watch after detecting the take-off signal, and switch the smart watch to at least one of a first mode, a second mode and a third mode, wherein: in the first mode, the display unit is deactivated, in the second mode, preset content is displayed on the display unit, and in the third mode, pairing between the smart watch and the external digital device is maintained rather than providing the notification indicating at least one event that is scheduled to occur after detecting the take-off signal. a display unit configured to display content; a communication unit configured to transmit and receive data; a sensor unit configured to detect an input signal to the smart watch and transmit the detected input signal to a processor, wherein the processor is configured to: control the display unit, the communication unit, and the sensor unit, perform pairing between the smart watch and an external digital device using the communication unit, detect a take-off signal in a worn mode of the smart watch, wherein the take-off signal is a signal indicating that the smart watch is separated from a user, and switch the smart watch to an unworn mode in response to the detected take-off signal, control the display unit, the communication unit, and the sensor unit, perform pairing between the smart watch and an external digital device using the communication unit, detect a take-off signal in a worn mode of the smart watch, wherein the take-off signal is a signal indicating that the smart watch is separated from a user, and switch the smart watch to an unworn mode in response to the detected take-off signal, characterized in that, in the unworn mode, the processor is further configured to: provide a notification indicating at least one event that is scheduled to occur in the smart watch after detecting the take-off signal, and switch the smart watch to at least one of a first mode, a second mode and a third mode, wherein: in the first mode, the display unit is deactivated, in the second mode, preset content is displayed on the display unit, and in the third mode, pairing between the smart watch and the external digital device is maintained rather than providing the notification indicating at least one event that is scheduled to occur after detecting the take-off signal. provide a notification indicating at least one event that is scheduled to occur in the smart watch after detecting the take-off signal, and switch the smart watch to at least one of a first mode, a second mode and a third mode, wherein: in the first mode, the display unit is deactivated, in the second mode, preset content is displayed on the display unit, and in the third mode, pairing between the smart watch and the external digital device is maintained rather than providing the notification indicating at least one event that is scheduled to occur after detecting the take-off signal. in the first mode, the display unit is deactivated, in the second mode, preset content is displayed on the display unit, and in the third mode, pairing between the smart watch and the external digital device is maintained rather than providing the notification indicating at least one event that is scheduled to occur after detecting the take-off signal.