3. The computer program product of claim 1 , the program further comprising: a code module for storing in a memory a character sequence history including a character sequence that has been previously used as a search keyword; a code module for propagating one or more candidate folders corresponding to the character sequence history in a search history folder and providing the terminal with identification information of the one or more candidate folders; a code module for, when a candidate folder is selected at the terminal, identifying a respective character sequence corresponding to the selected candidate folder; a code module for searching for files by using as the search keyword the respective character sequence, for generating one or more files retrieved by the search, and for providing the terminal with information of the generated files at the hierarchical layer of the selected candidate folder.
3. The computer program product of claim 1 , the program further comprising: a code module for storing in a memory a character sequence history including a character sequence that has been previously used as a search keyword; a code module for propagating one or more candidate folders corresponding to the character sequence history in a search history folder and providing the terminal with identification information of the one or more candidate folders; a code module for, when a candidate folder is selected at the terminal, identifying a respective character sequence corresponding to the selected candidate folder; a code module for searching for files by using as the search keyword the respective character sequence, for generating one or more files retrieved by the search, and for providing the terminal with information of the generated files at the hierarchical layer of the selected candidate folder. 4. The computer program product of claim 3 , wherein the code module for providing the terminal with information of the candidate folder propagates in the search history folder the one or more candidate folders corresponding to the character sequence history that at least partially contains a previous character sequence and provides the terminal with identification information of the one or more candidate folders.