FIG. 10 illustrates that a photograph icon 1010, a music icon 1020, a video icon 1030, and a document icon 1040 are disposed in the wearable device 100. The photograph icon 1010, the music icon 1020, the video icon 1030, and the document icon 1040 may each represent a program or an application that executes each of the respective functions. When the photograph icon 1010 is selected, the wearable device 100 may execute a function of displaying photographs. When the music icon 1020 is selected, the wearable device 100 may execute a function of playing a song. When the video icon 1030 is selected, the wearable device 100 may execute a function of playing a video. When the document icon 1040 is selected, the wearable device 100 may execute a program of performing a document operation.
As illustrated in FIG. 10, when the user touches the music icon 1020, the wearable device 100 may sense a touch input as an event and may perform the vein authentication. The wearable device 100 may control the sensor 110 to capture a vein image of the user. The wearable device 100 may identify the user by comparing the captured vein image with registered first and second vein images.
