SCROLL POSITION ESTIMATION APPARATUS AND METHOD

A scroll position estimation apparatus includes a unit acquiring a complex document including main data and sub-data items, the main data being for determining a layout of presentation of the complex document, a unit visualizing the main data, a unit presenting the visualized main data, a unit acquiring scroll positions indicating display areas of the presented main data, a unit storing pairs of the scroll positions and times of acquiring the scroll positions, a unit estimating a future scroll position based on the scroll positions and the times, a unit computing priority levels of the sub-data items based on the estimated scroll position, the priority levels being used to determine order of visualization, a unit sequentially visualizing the sub-data items in accordance with the computed priority levels of the sub-data items, and a unit presenting the visualized sub-data items.