A system, method and user apparatus dynamically reclassify and retrieve target information object(s) among multiple information objects stored on a memory. Multiple attribute classifiers are corresponsive to the information objects. Displayable dynamical reclassifying hints (DRHs) are provided according to user input signal(s). When a first attribute classifier is determined by a central processing unit according to the user input signal, second attribute classifier(s) is determined and combined with one of the attribute classifiers together visibly on a display unit; wherein the second attribute classifier and the combined one of attribute classifier corresponds to same one(s) of the information objects. The DRH(s) combines the attribute classifiers with the same search results together, so as to eliminate possible repeated steps or processes that lead to the same search result(s), and also to reduce the remained selectable attribute classifiers and the following steps to retrieve the target information objects.