An information processing apparatus for processing related information about existing document information and specific document information is provided. The apparatus includes: an acquiring element for acquiring the related information corresponding to the existing document information. The acquiring is based on firstly, a first characteristic word extracted by an extracting element, and secondly a first weight modified by a weight modifying element. The apparatus further includes: a display controlling element for controlling display of the related information corresponding to the existing document information searched for by a searching element; and an attribute information extracting element for extracting attribute information from the existing document information and the specific document information; wherein the weight modifying element modifies the first weight based on the attribute information extracted byte attribute information extracting element.