1. An image processing apparatus for identifying a target area used as a target of processing among image data and performing predetermined processing, comprising: a division unit for dividing the image data into plural partial areas based on a predetermined division rule; a saliency calculation unit in which each of the plural partial areas is used as an attentional partial area and based on a feature quantity related to at least one of values or the number of pixels included in the attentional partial area and a feature quantity included in at least one of the other partial areas adjacent to each of the partial areas, a saliency feature value related to the attentional partial area is calculated to generate a saliency feature value every each of the partial areas; and a detecting unit for deciding a target area used as a target of predetermined processing based on the saliency feature value every the partial area.