Display system and display method

A display system for a work machine, the display system comprising:

• a processor and a storage unit,
• wherein the processor has functional elements including:
• an acquisition unit configured to acquire three-dimensional data of an actual terrain of a plurality of measurement points measured by a distance detection device mounted in the work machine;
• a conversion unit configured to convert the three-dimensional data into a vehicle body coordinate system defined in association with a vehicle body of the work machine;
• an image generation unit configured to generate a reference image representing a three-dimensional shape of the actual terrain based on the three-dimensional data converted into the vehicle body coordinate system;
• and
• a display processing unit configured to display the reference image on an image captured by an imaging device in a superimposed manner,
• wherein the image generation unit decides a display form of the reference image at a position of the reference image corresponding to each measurement point depending on a distance of the measurement point in a normal direction with respect to a ground surface of the work machine, in a target on which the work machine travels or performs work.