Program comparison apparatus, program comparison method, and computer readable medium

A program comparison method comprising:

• dividing a first program which is a first function block diagram program into sets of program components connected to one another in the first program, and rearranging the sets of the first program in a line along a Y-axis direction which is a vertical direction in ascending order of execution, and also dividing a second program which is a second function block diagram program into sets of program components connected to one another in the second program, and rearranging the sets of the second program in a line along the Y-axis direction in ascending order of execution, the first program including a plurality of the sets of first program components arranged in an X-axis direction which is a horizontal direction, and the second program including a plurality of the sets of second program components arranged in the X-axis direction which is the horizontal direction;
• detecting a difference in the sets between the first program and the second program as difference information by comparing the sets of the first program rearranged and the sets of the second program rearranged;
• and
• causing the sets of the first program and the sets of the second program that are rearranged, to be displayed within a screen of a display device that displays the first program and the second program, and causing the first program and the second program to be displayed side by side such that each of the sets of the first program and each of the sets of the second program corresponding to each other are displayed at the same level in the Y-axis direction, on the basis of the difference information.

A non-transitory computer readable medium that stores a program comparison program that causes a computer to execute:

• dividing a first program which is a first function block diagram program into sets of program components connected to one another in the first program, and rearranging the sets of the first program in a line along a Y-axis direction which is a vertical direction in ascending order of execution, and also dividing a second program which is a second function block diagram program into sets of program components connected to one another in the second program, and rearranging the sets of the second program in a line along the Y-axis direction in ascending order of execution, the first program including a plurality of the sets of first program components arranged in an X-axis direction which is a horizontal direction, and the second program including a plurality of the sets of second program components arranged in the X-axis direction which is the horizontal direction;
• detecting a difference in the sets between the first program and the second program as difference information by comparing the sets of the first program rearranged and the sets of the second program rearranged;
• and
• causing the sets of the first program and the sets of the second program that are rearranged, to be displayed within a screen of a display device that displays the first program and the second program, and causing the first program and the second program to be displayed side by side such that each of the sets of the first program and each of the sets of the second program corresponding to each other are displayed at the same level in the Y-axis direction, on the basis of the difference information.