DISPLAY CONTROL DEVICE FOR WORK MACHINE, WORK MACHINE, AND DISPLAY CONTROL METHOD FOR WORK MACHINE

A control line determinator determines whether or not a work state of a work implement is a predetermined work state. A display controller generates a display signal including a target surface of a construction object or a control line indicating a surface which is different from the target surface and which a bucket is to be prevented from entering. The display controller makes a display form of the control line or the target surface in the display signal different according to whether or not the work state is the predetermined work state.