1. A method of adjusting the relative position of a first dot and a second dot being printed on a printing medium, comprising: selecting either a first adjustment mode for use with a first print medium, or a second adjustment mode for use with a second print medium, wherein positions of the dots can be adjusted with higher accuracy in said second adjustment mode than said first adjustment mode; determining whether a print medium to be printed is the first print medium or the second print medium; selecting the first adjustment mode if the first print medium is determined and in a case where the second adjustment mode is selected; acquiring an adjustment value using the selected adjustment mode; and adjusting the relative position of the second dot relative to the first dot using the acquired adjustment value.