In a robot operation terminal, a storage unit has a group-belonging article table that indicates articles belonging to each of groups. Upon receipt of operation information indicating an operation to be instructed to the robot through an input unit, when this operation information specifies a group as its operation subject, a conversion unit converts this group to articles belonging to the group in the operation information by reference to the group-belonging article table. Thus, the instruction of an operation is made simpler, thereby reducing the occurrence of a human error.