A wearable device, comprising: a first sensor configured to detect a first movement of a first segment (204, 205) of a first finger of a user when the wearable device is worn on a second segment of the first finger by being configured to detect a first distance between the first sensor and the first segment of the first finger; a second sensor configured to detect a second movement of a first segment of a second finger, the second finger being different from the first finger, by being configured to detect a second distance between the second sensor and the first segment of the second finger; and a controller configured to: detect a multi-finger gesture by determining a relative movement between the first and second fingers (201, 202) based on the first and second movements; and control, based on the multi-finger gesture, a terminal device associated with the wearable device, wherein the wearable device further comprises: a first conductor assembly including a first end coupled to the first sensor and a second end extending from the wearable device and orientating to the first finger to detect the first distance; and a second conductor assembly including a third end coupled to the second sensor and a fourth end extending from the wearable device and orientating to the second finger to detect the second distance. a first sensor configured to detect a first movement of a first segment (204, 205) of a first finger of a user when the wearable device is worn on a second segment of the first finger by being configured to detect a first distance between the first sensor and the first segment of the first finger; a second sensor configured to detect a second movement of a first segment of a second finger, the second finger being different from the first finger, by being configured to detect a second distance between the second sensor and the first segment of the second finger; and a controller configured to: detect a multi-finger gesture by determining a relative movement between the first and second fingers (201, 202) based on the first and second movements; and control, based on the multi-finger gesture, a terminal device associated with the wearable device, detect a multi-finger gesture by determining a relative movement between the first and second fingers (201, 202) based on the first and second movements; and control, based on the multi-finger gesture, a terminal device associated with the wearable device, wherein the wearable device further comprises: a first conductor assembly including a first end coupled to the first sensor and a second end extending from the wearable device and orientating to the first finger to detect the first distance; and a second conductor assembly including a third end coupled to the second sensor and a fourth end extending from the wearable device and orientating to the second finger to detect the second distance. a first conductor assembly including a first end coupled to the first sensor and a second end extending from the wearable device and orientating to the first finger to detect the first distance; and a second conductor assembly including a third end coupled to the second sensor and a fourth end extending from the wearable device and orientating to the second finger to detect the second distance.