A droplet sorting device comprising: a detection device configured to detect a state of a satellite droplet ejected from an orifice of a flow channel structure; and a controller configured to control a frequency and an amplitude of a driving voltage supplied to a vibration element based on a position of the satellite droplet, wherein the vibration element is configured to vibrate the flow channel structure and the position of the satellite droplet is a relative position to a droplet adjacent to the satellite droplet; wherein the detection device comprises: an image sensor configured to acquire an image of the droplet and the satellite droplet; and a processor configured to distinguish between the droplet and the satellite droplet based on the image acquired by the image sensor; and wherein the controller is further configured to control the frequency of the driving voltage in a manner that the satellite droplet is absorbed in the droplet within a given region from a position where a fluid discharged from the orifice is broken into the droplet and satellite droplet; wherein the image sensor is arranged to acquire an image of the position where the fluid discharged from the orifice is broken into the droplet and the satellite droplet under two or more conditions of different frequencies of the driving voltage, and wherein the processor is further configured to rank the different frequencies into ranked frequencies based upon a distance between the orifice and a position at which the fluid is broken into the droplet and the satellite droplet, wherein higher ranked frequencies correspond to a lower distance between the orifice and a position at which the fluid is broken into the droplet and the satellite droplet; wherein the controller is further configured to control the frequency of the driving voltage to step through the ranked frequencies and to vary the amplitude of the driving voltage to determine a first frequency for which the position where the fluid is broken into the droplet and the satellite droplet moves toward the orifice as the amplitude of the driving voltage increases and for which the satellite droplet is absorbed in the droplet within the given region from the position where the fluid discharged from the orifice is broken into the droplet and satellite droplet. a detection device configured to detect a state of a satellite droplet ejected from an orifice of a flow channel structure; and a controller configured to control a frequency and an amplitude of a driving voltage supplied to a vibration element based on a position of the satellite droplet, wherein the vibration element is configured to vibrate the flow channel structure and the position of the satellite droplet is a relative position to a droplet adjacent to the satellite droplet; wherein the detection device comprises: an image sensor configured to acquire an image of the droplet and the satellite droplet; and a processor configured to distinguish between the droplet and the satellite droplet based on the image acquired by the image sensor; and wherein the controller is further configured to control the frequency of the driving voltage in a manner that the satellite droplet is absorbed in the droplet within a given region from a position where a fluid discharged from the orifice is broken into the droplet and satellite droplet; an image sensor configured to acquire an image of the droplet and the satellite droplet; and a processor configured to distinguish between the droplet and the satellite droplet based on the image acquired by the image sensor; and wherein the controller is further configured to control the frequency of the driving voltage in a manner that the satellite droplet is absorbed in the droplet within a given region from a position where a fluid discharged from the orifice is broken into the droplet and satellite droplet; wherein the image sensor is arranged to acquire an image of the position where the fluid discharged from the orifice is broken into the droplet and the satellite droplet under two or more conditions of different frequencies of the driving voltage, and wherein the processor is further configured to rank the different frequencies into ranked frequencies based upon a distance between the orifice and a position at which the fluid is broken into the droplet and the satellite droplet, wherein higher ranked frequencies correspond to a lower distance between the orifice and a position at which the fluid is broken into the droplet and the satellite droplet; wherein the controller is further configured to control the frequency of the driving voltage to step through the ranked frequencies and to vary the amplitude of the driving voltage to determine a first frequency for which the position where the fluid is broken into the droplet and the satellite droplet moves toward the orifice as the amplitude of the driving voltage increases and for which the satellite droplet is absorbed in the droplet within the given region from the position where the fluid discharged from the orifice is broken into the droplet and satellite droplet.