A non-transitory computer-readable medium storing processor executable instructions which, when executed by a least one processor, cause the at least one processor to perform a method for controlling an apparatus including a wearable tracking sensor and a wearable image acquisition sensor that is associated with the wearable tracking sensor such that a motion of the wearable tracking sensor causes a motion of the wearable image acquisition sensor, the method comprising:
- a) receiving output from the wearable tracking sensor;
- b) determining, using the received output of the wearable tracking sensor, a relative positional relationship change between the apparatus and a tracking target object included in image data output by the wearable image acquisition sensor;
- and
- c) adjusting, using the determined relative positional relationship change, a position of the target tracking object within a display screen.