In an output control method for an image processing apparatus which has a function to invert a recording sheet and continuously performs image forming and outputting for the plural recording sheets in order to prevent that the recording sheets inverted and discharged and the recording sheets incapable of being inverted and thus discharged as it is mix together in one job, it is checked whether or not there is an instruction to invert the recording sheet, it is further judged if there is the instruction whether or not each of the plural recording sheets can be inverted by the inversion function, and if the recording sheet incapable of being inverted exists, all of the plural recording sheets are output without any inversion.