1. An image processing apparatus comprising: a Scanning Laser Ophthalmoscope (SLO) image acquisition unit configured to acquire a plurality of SLO images obtained by an SLO apparatus that scans a target to be captured with signal light at various focus positions in an optical axis direction of the signal light; a structure acquisition unit configured to acquire a specific structure of the target to be captured; a selection unit configured to select a plurality of partial images focused on the specific structure from the plurality of SLO images according to the specific structure; and an object image generation unit configured to generate an integrated image of the specific structure by combining the plurality of partial images.