A liquid droplet discharging control device for a liquid droplet discharging apparatus which includes a liquid droplet discharging head in which a plurality of nozzles for discharging liquid droplets are formed, is adapted to discharge liquid droplets of different sizes from the nozzles, and discharges liquid droplets while relatively moving the head and a medium in a direction intersecting a direction in which the nozzles are arranged, wherein each nozzle is capable of forming a dot row extending in the relative movement direction, the device comprising: a controller adapted to control two different sizes of dot to be ejected, wherein the two different sizes of dot consist of a normal size and a large size, wherein a dot of the normal size is formed by using a signal waveform for forming a dot of a normal size, wherein a dot of the large size is formed by using the signal waveform for forming a dot of a normal size twice, and wherein two waveform signal lines (comA, comB) are provided for forming said two different sizes of dot, the controller being adapted to control a first nozzle adjacent to a predetermined target nozzle, which is not capable of discharging a liquid droplet, to discharge a liquid droplet onto a first predetermined dot position such that the size of a dot formed is the large size rather than the medium size of the dot that would have been formed by the liquid droplet discharged by the first nozzle if the predetermined target nozzle had been capable of discharging a liquid droplet, wherein said first predetermined dot position is a position corresponding to a dot row adjacent to a dot row corresponding to said predetermined target nozzle, and the controller being adapted to select whether or not a second nozzle, adjacent to the first nozzle and distant from the predetermined target nozzle, discharges a liquid droplet onto a second predetermined dot position, wherein the size of a dot formed by the second nozzle is the medium size, which is the same as it would have been if the predetermined target nozzle had been capable of discharging a liquid droplet, and wherein said second predetermined dot position is a position corresponding to a dot row adjacent to said dot row corresponding to said first nozzle and is not a position corresponding to said dot row corresponding to said predetermined target nozzle, wherein the controller is adapted to select whether or not the second nozzle discharges a liquid droplet for a dot on the basis of printing control data of liquid droplets discharged by the predetermined target nozzle and nozzles in the vicinity of the predetermined target nozzle. a controller adapted to control two different sizes of dot to be ejected, wherein the two different sizes of dot consist of a normal size and a large size, wherein a dot of the normal size is formed by using a signal waveform for forming a dot of a normal size, wherein a dot of the large size is formed by using the signal waveform for forming a dot of a normal size twice, and wherein two waveform signal lines (comA, comB) are provided for forming said two different sizes of dot, the controller being adapted to control a first nozzle adjacent to a predetermined target nozzle, which is not capable of discharging a liquid droplet, to discharge a liquid droplet onto a first predetermined dot position such that the size of a dot formed is the large size rather than the medium size of the dot that would have been formed by the liquid droplet discharged by the first nozzle if the predetermined target nozzle had been capable of discharging a liquid droplet, wherein said first predetermined dot position is a position corresponding to a dot row adjacent to a dot row corresponding to said predetermined target nozzle, and the controller being adapted to select whether or not a second nozzle, adjacent to the first nozzle and distant from the predetermined target nozzle, discharges a liquid droplet onto a second predetermined dot position, wherein the size of a dot formed by the second nozzle is the medium size, which is the same as it would have been if the predetermined target nozzle had been capable of discharging a liquid droplet, and wherein said second predetermined dot position is a position corresponding to a dot row adjacent to said dot row corresponding to said first nozzle and is not a position corresponding to said dot row corresponding to said predetermined target nozzle, wherein the controller is adapted to select whether or not the second nozzle discharges a liquid droplet for a dot on the basis of printing control data of liquid droplets discharged by the predetermined target nozzle and nozzles in the vicinity of the predetermined target nozzle.