1. An image processing apparatus comprising: a memory which stores instructions; and one or more processors which execute the instructions to cause the image processing apparatus to function as: an acquisition unit configured to acquire one or more objects of page data; a check unit configured to perform check processing for checking whether to combine an object with another object, for each of a plurality of objects acquired by the acquisition unit; a determining unit configured to determine, based on a result of the check processing for each of the plurality of objects, whether to perform the check processing for checking whether to combine an object with another object, for an object acquired subsequently to the plurality of objects by the acquisition unit; and a generating unit configured to generate, based on the determination, intermediate data of the subsequently acquired object without performing the check processing on the subsequently acquired object.