Display system in hydraulic shovel and control method therefor

A display system for displaying a guidance picture showing a current position of a hydraulic shovel having a main vehicle body and a work machine attached to the main vehicle body, and a target surface selected from a plurality of design surfaces constituting a design land shape, the display system comprising:

• a land shape data storage unit configured and arranged to store land shape data indicating a position of the target surface;
• a work machine data storage unit configured and arranged to store work machine data indicating a maximum reach length of the work machine;
• a position detector unit configured and arranged to detect the current position of the main vehicle body;
• a calculation unit configured to set a predetermined display range displayed as the guidance picture for the land shape data, to calculate a position of a start point nearest the main vehicle body and a position of an end point set apart from the start point by the maximum reach length of the work machine on a cross section of the target surface as seen from a side of the main vehicle body based on the land shape data, the work machine data, and the current position of the main vehicle body, and to calculate a position of a predetermined reference point in the display range based on the positions of the start point and the end point;
• and
• a display unit configured an arranged to display the guidance picture showing the cross section of the target surface included in the display range as seen from the side, and the current position of the hydraulic shovel.