Image processing apparatus controlling the order of storing decompressed data, and method thereof

An image processing apparatus comprising:

• at least one processor configured to:
• receive print data of a page including a first compressed image and a second compressed image succeeding the first compressed image;
• decompress the first compressed image included in a first band of the print data;
• store, in a first memory area of a buffer, a first decompressed image which is obtained by decompressing the first compressed image;
• determine if the second compressed image is included in a band away from the first band;
• allocate, in a case that it is determined that the second compressed image is included in the band away from the first band, a memory area that overlaps with the first memory area in the buffer for a decompression result of the second compressed image;
• allocate, in a case that it is determined that the second compressed image is included in the band, which is not away from the first band, but is same as or adjacent to the first band, a memory area that does not overlap with the first memory area in the buffer for a decompression result of the second compressed image.