A display system (30, 70) of a work machine, which includes a work implement and a machine main body, the display system comprising: a storage (30j, 73) that stores time-series work machine motion information including motion information of the work machine, wherein the motion information of the work machine includes work implement data relating to detection signals from a detector or sensor, and position information of the work machine, characterized by further comprising: a motion image generator that generates time-series first, second, and third motion state image data of the work machine, wherein: - the first motion state image data is based on 3D geometrical model data stored in advance in the storage (30j, 73) for generating a reference image of a 3D model geometry of the work machine and on the work implement data included in the work machine motion information, - the second motion state image data is based on side surface geometrical model data for generating a reference image of a geometry of a side surface model of the work machine and inclination data included in the position information of the work machine, and - the third motion state image data is based on top-view geometrical model data for generating a reference image of a geometry of a top view model of the work machine and articulation angle data included in the work machine motion information; and a display that shows a motion screen based on the time-series first, second, and third motion state image data, including: - a work state image based on the first motion state image data, - an inclined state image based on the second motion state image data, and - an articulated state image based on the third motion state image data. a storage (30j, 73) that stores time-series work machine motion information including motion information of the work machine, wherein the motion information of the work machine includes work implement data relating to detection signals from a detector or sensor, and position information of the work machine, characterized by further comprising: a motion image generator that generates time-series first, second, and third motion state image data of the work machine, wherein: - the first motion state image data is based on 3D geometrical model data stored in advance in the storage (30j, 73) for generating a reference image of a 3D model geometry of the work machine and on the work implement data included in the work machine motion information, - the second motion state image data is based on side surface geometrical model data for generating a reference image of a geometry of a side surface model of the work machine and inclination data included in the position information of the work machine, and - the third motion state image data is based on top-view geometrical model data for generating a reference image of a geometry of a top view model of the work machine and articulation angle data included in the work machine motion information; and a display that shows a motion screen based on the time-series first, second, and third motion state image data, including: - a work state image based on the first motion state image data, - an inclined state image based on the second motion state image data, and - an articulated state image based on the third motion state image data. a motion image generator that generates time-series first, second, and third motion state image data of the work machine, wherein: - the first motion state image data is based on 3D geometrical model data stored in advance in the storage (30j, 73) for generating a reference image of a 3D model geometry of the work machine and on the work implement data included in the work machine motion information, - the second motion state image data is based on side surface geometrical model data for generating a reference image of a geometry of a side surface model of the work machine and inclination data included in the position information of the work machine, and - the third motion state image data is based on top-view geometrical model data for generating a reference image of a geometry of a top view model of the work machine and articulation angle data included in the work machine motion information; and - the first motion state image data is based on 3D geometrical model data stored in advance in the storage (30j, 73) for generating a reference image of a 3D model geometry of the work machine and on the work implement data included in the work machine motion information, - the second motion state image data is based on side surface geometrical model data for generating a reference image of a geometry of a side surface model of the work machine and inclination data included in the position information of the work machine, and - the third motion state image data is based on top-view geometrical model data for generating a reference image of a geometry of a top view model of the work machine and articulation angle data included in the work machine motion information; and a display that shows a motion screen based on the time-series first, second, and third motion state image data, including: - a work state image based on the first motion state image data, - an inclined state image based on the second motion state image data, and - an articulated state image based on the third motion state image data. - a work state image based on the first motion state image data, - an inclined state image based on the second motion state image data, and - an articulated state image based on the third motion state image data.