Candidate character strings representing objects disposed in a work cell,
models for robot operation instructions which has variable parts, and
robot commands related to the objects are defined in advance. By
inputting a query such as `Workpiece 1?` by voice, the object concerned
is indicated by a display color so that the work cell can be confirmed.
Models for operation instructions and a program to be edited are
displayed to allow an operator to select the portion to be edited. When
an operation instruction is input by voice in the model pattern,
candidate character strings are assigned to the variable parts of the
model. A completed statement that matches the voice-recognized statement
is found, the robot operation commands defined for the objects are
displayed, and the robot operation is displayed on the screen. The
operation commands are inserted at the desired location in the program.
