A printing apparatus is provided which executes duplex printing on each print medium one by one when printing of a surface to be printed first of both surfaces of an (N+1)th print medium cannot be performed before starting printing of a surface to be printed later of both surfaces of an Nth print medium and continuously prints two print media when printing of a part of the surface to be printed first of the (N+1)th print medium can be performed before starting printing of the surface to be printed later of the Nth print medium.