A printer includes a first print head that performs printing on one side surface of the print medium and a second print head that performs printing on the other side surface of the print medium and abnormality detection sensors that are attached respectively to the first and second print heads. A printer performs control such that in the case where any abnormality is detected in one of the first and second print heads, print data to be printed using one print head in which the abnormality has been detected is printed using the other print head which is normally operating.