Abstract: One embodiment according to the present disclosed technology provides an image processing apparatus, an image processing system, an image processing method, and an image processing program for outputting a warning from an output device based on an indicator for concatenation of moving images. According to an aspect of the present invention, there is provided an image processing apparatus including a processor, in which the processor performs: image acquisition processing of acquiring a plurality of moving images having overlapping imaging ranges; information acquisition processing of acquiring information on a stitching region to be used for concatenation of the plurality of moving images; indicator calculation processing of calculating an indicator based on a distance between a subject and a stitching line set in the stitching region; and warning processing of outputting a warning from an output device based on the indicator.