1. An improved information filtering system for filtering out sensitive information from content, which comprises: a processor; and a memory communicatively coupled to the processor and storing instructions that upon execution by the processor cause the system to: acquire text content; scan the text content through a preset keyword dictionary; in response to a determination that the text content contains a plurality of keywords stored in the preset keyword dictionary, determine a position of each of the plurality of keywords in the text content; determine at least one character pitch between any two of the plurality of keywords in the text content based on the position of each keyword among the plurality of keywords, wherein the at least one character pitch is a difference between positions of any two of the plurality of keywords in the text content; determine whether the at least one character pitch does not exceed a preset character pitch; in response to a determination that the at least one character pitch does not exceed the preset character pitch, filter out the plurality of keywords from the text content; wherein the preset keyword dictionary further stores a preset order of at least two keywords among all of the keywords that need to be filtered out; and wherein the memory further stores instructions that upon execution by the processor cause the system to: determine the order of the plurality of keywords according to the position of each keyword among the plurality of keywords in the text content, compare the order of the plurality of keywords in the text content with the preset order of corresponding keywords stored in the keyword dictionary, and when the order of the plurality of keywords in the text content matches the preset order of the corresponding keywords stored in the keyword dictionary, determine that the plurality of keywords satisfy the preset order.
2. The system according to claim 1 , wherein the plurality of keywords are words constituting sensitive information and the preset keyword dictionary stores all of keywords that need to be filtered out.