To improve the developing efficiency of an object directional program by efficiently operating the selection and connection of pins, and easily grasping a control flow.

The output of an arbitrary instruction connecting means is set in a start point storage area as the starting position of a program, and the hierarchy of the object and the name of an instruction connecting means are displayed in a table format by an inter-object control flow editing means 2, and a connection relation between the output and input of the instruction connecting means is displayed in a tree structure. Then, the change of the order of the control flow, the cutting of the control flow, the re-use of the cut control flow, and the deletion and addition of the control flow or the like is operated. Also, the hierarchy of the object and the name of a means for connecting the data of the objects are displayed in a table format by an inter- object data sharing editing means 2 so that data can be shared by the two objects, and the sharing of the data shared by the two objects can be released.