PURPOSE: To make it possible to correct control data by only once operation to shift a tool tip to a position indicated on a program by reading the axial coordinates of a robot with the tool tip coinciding with an alignment mark, and tanking discrepancy between the above-read value and the coordinates of the mark as offset quantity into control data.

CONSTITUTION: A robot and a leak holder are placed to keep a fixed positional relationship, and a leak in the leak holder is processed (applied) with a tool (for instance an applying nozzle) held by a hand of the robot. In this case, an alignment mark 61 is provided at a position having the fixed positional relationship to the axial coordinate origin 60 of the robot. A tool tip is made to coincide with the mark 61, and then the axial coordinates of the robot are read, and discrepancy (Δx, Δy) between the read values and the coordinates (x1, y1) of the assignment mark 61 are taken as offset quantities into control data to correct time. The tool tip is thereby shifted to a position indicated on a program.