To provide a D/A converter and a D/A converting method in which a nonlinear error of an analog output obtained in accordance with a digital input can be decreased without using any specific analog process. An n-bit D/A converter (2) includes: correction signal generating means (4) for generating an m-bit digital correction signal (wherein m is a positive integer) in accordance with an n-bit digital input signal D (wherein n is a positive integer of 2 or more); and D/A conversion means (6) for converting an (n+m)-bit digital signal consisting of the n-bit input signal D and the m-bit correction signal into an analog signal.