To provide a work instruction method and a work instruction system displaying work instruction in a simple reference mode so as to intuitively grasp the gist of the work and greatly improving the working efficiency.

This work instruction system for instructing the work by projecting work instruction information on a work W is provided with work instruction database 1 storing the work instruction information, an output device 3 projecting the work instruction information extracted from the work instruction database 1 on the work W, and a control device 2 extracting the work instruction information from the work instruction database 1 and controlling the output device 3. The work instruction information is automatically projected according to the time schedule of the work.