A handy mobile printer comprising: a plurality of nozzles to discharge a liquid droplet onto a medium; a liquid droplet discharging controller to receive image data, the liquid droplet discharging controller to control: each of the nozzles to discharge the liquid droplet in an amount defined by the image data onto a target discharging position on the medium, which corresponds to a pixel position defined by the image data; a navigation sensor to detect a moving amount of the handy mobile printer; and a gyroscope to detect an angular velocity of the handy mobile printer, wherein the liquid droplet discharging controller controls the each of the nozzles to discharge the liquid droplet in the amount defined by the image data onto the target discharging position on the medium based on the detected moving amount and the detected angular velocity, characterized in that the liquid droplet discharging controller controls at least one of the nozzles to discharge the liquid droplet for a controlled number of times smaller than a number of times N, N representing an integer not smaller than 2, in an amount greater than the amount defined by the image data onto the target discharging position on the medium; the handy mobile printer further comprises a frequency recorder to record the controlled number of times of discharging for each of the at least one of the nozzles, and a pixel recorder to record the pixel position defined by the image data, wherein the pixel recorder does not record the pixel position for which the liquid droplet discharging controller controls the at least one of the nozzles to discharge the liquid droplet for a controlled number of times smaller than the number of times N plus one, and wherein the liquid droplet discharging controller controls the each of the nozzles to discharge the liquid droplet based on the image data corresponding to the pixel position not recorded by the pixel recorder. a plurality of nozzles to discharge a liquid droplet onto a medium; a liquid droplet discharging controller to receive image data, the liquid droplet discharging controller to control: each of the nozzles to discharge the liquid droplet in an amount defined by the image data onto a target discharging position on the medium, which corresponds to a pixel position defined by the image data; a navigation sensor to detect a moving amount of the handy mobile printer; and a gyroscope to detect an angular velocity of the handy mobile printer, wherein the liquid droplet discharging controller controls the each of the nozzles to discharge the liquid droplet in the amount defined by the image data onto the target discharging position on the medium based on the detected moving amount and the detected angular velocity, characterized in that the liquid droplet discharging controller controls at least one of the nozzles to discharge the liquid droplet for a controlled number of times smaller than a number of times N, N representing an integer not smaller than 2, in an amount greater than the amount defined by the image data onto the target discharging position on the medium; the handy mobile printer further comprises a frequency recorder to record the controlled number of times of discharging for each of the at least one of the nozzles, and a pixel recorder to record the pixel position defined by the image data, wherein the pixel recorder does not record the pixel position for which the liquid droplet discharging controller controls the at least one of the nozzles to discharge the liquid droplet for a controlled number of times smaller than the number of times N plus one, and wherein the liquid droplet discharging controller controls the each of the nozzles to discharge the liquid droplet based on the image data corresponding to the pixel position not recorded by the pixel recorder.