An augmented reality, AR, based tidal current display device for superimposing tidal current information on an image displayed on a display screen, comprising: an image information terminal configured to receive an image captured by an image sensor and output image data for displaying on the display screen; an image sensor information terminal configured to receive and store image sensor information including a position and an azimuthal orientation of the image sensor attached to a movable body on a water surface; a chart information terminal configured to receive and store chart information indicating a chart of the region including the movable body; a tidal current information terminal configured to receive and store tidal current information including positions of tidal currents on the water surface pertaining to one or more locations in the chart from an external communication equipment; a tidal current selection unit configured to: determine a sub-region in the region of the chart based on the image sensor information; and select one or more tidal currents (204, 205) located in the sub-region; a position calculation unit configured to, for each selected tidal current, calculate a corresponding display position on the display screen based on the tidal current information and the image sensor information; a tidal current superimposition unit configured to generate a symbol for each selected tidal current to indicate each display position on the display screen, and output each symbol to the display screen, wherein the symbol is configured in the shape of a marker indicating a display position of corresponding tidal current on the display screen; and wherein the tidal current superimposition unit is further configured to superimpose each symbol at the respective display position on an image displayed on the display screen based on the image data. an image information terminal configured to receive an image captured by an image sensor and output image data for displaying on the display screen; an image sensor information terminal configured to receive and store image sensor information including a position and an azimuthal orientation of the image sensor attached to a movable body on a water surface; a chart information terminal configured to receive and store chart information indicating a chart of the region including the movable body; a tidal current information terminal configured to receive and store tidal current information including positions of tidal currents on the water surface pertaining to one or more locations in the chart from an external communication equipment; a tidal current selection unit configured to: determine a sub-region in the region of the chart based on the image sensor information; and select one or more tidal currents (204, 205) located in the sub-region; determine a sub-region in the region of the chart based on the image sensor information; and select one or more tidal currents (204, 205) located in the sub-region; a position calculation unit configured to, for each selected tidal current, calculate a corresponding display position on the display screen based on the tidal current information and the image sensor information; a tidal current superimposition unit configured to generate a symbol for each selected tidal current to indicate each display position on the display screen, and output each symbol to the display screen, wherein the symbol is configured in the shape of a marker indicating a display position of corresponding tidal current on the display screen; and wherein the tidal current superimposition unit is further configured to superimpose each symbol at the respective display position on an image displayed on the display screen based on the image data.