A system for teaching a robot includes a wearable device having a plurality of sensors for sensing signals representing at least one movement, orientation, position, force, and torque of any part of a user's body applied on a target. The system further includes a processing device configured to receive the sensed signals, the processing device further configured to store the sensed signals defining as data of teaching commands, a controller for controlling a robot receives the data of teaching commands and operates the robot according to the received data of teaching commands, an object sensor to detect position and orientation of an object as a workpiece of the robot, and a visual input device communicatively coupled to at least one of the processing device and the controller.