1. A robot language processing apparatus for displaying a robot program which has been already taught, comprising: display means for graphically displaying a picture and capable of designating a position in the displayed picture with pointing means; storage means for storing said robot program; and processing means for displaying an operation interval and an air-cut interval as successive lines on said display means by referring to said robot program, and controlling said display means to display the type of an operation detail at either one of said lines when said either one of the displayed lines is designated by said pointing means.
3. The robot language processing apparatus according to claim 1, wherein said robot program comprises an operating program for a welding robot, and said processing means moves a bright spot on the lines at a speed corresponding to a welding speed.