This invention provides a layout adjustment method of determining the layout of a page on the basis of layout information representing the intra-page layout of a plurality of partial regions in which images based on assigned data are visually drawn. In the layout adjustment method, the layout information contains, for a region set in which a plurality of partial regions arrayed in a predetermined directions are grouped, the total size in the predetermined direction and the flexible range of the distance between the partial regions. The layout information and data corresponding to each partial region are acquired from a memory. For each of the plurality of partial regions included in the region set, a size suitable for drawing the assigned data is calculated. At least the distance between the partial regions is changed within the flexible range on the basis of the total size and the calculated size of each partial region, thereby adjusting the layout of the region set.