A terminal device is configured to photograph a first image including a work target and a marker for the work target, and a second image including a robot marker, the work target, and the marker for the work target, which maintain a positional relation in the first image, set a user coordinate system using the marker for the work target as a reference, set an operation path based on a work spot of the work target included in the first image, create a work program based on the set operation path of the industrial robot, calculate a robot coordinate system based on the robot marker included in the second image and position attitude information of the industrial robot, and modify the work program by converting a coordinate system of the operation path of the industrial robot from the user coordinate system to the robot coordinate system.