Abstract: An average vehicle speed calculation system and an average vehicle speed calculation method thereof are provided. The average vehicle speed calculation system comprises a calculation module and a mobile body. The mobile body includes a body speed detector, a radar speed detector and a transceiver. The body speed detector detects a body speed. The radar speed detector detects at least one speed of an adjacent vehicle. The transceiver connects to the calculation module via a network, and transmits the body speed and the at least one speed of the adjacent vehicle to the calculation module. The calculation module calculates an average vehicle speed according to the body speed and the at least one speed of the adjacent vehicle.

Abstract: This invention discloses a method for mining a comment term in a document. The method comprises, first, to build a document database and a keyword database, wherein the document database includes at least one digital document, the keyword database includes at least one keyword. Then, a language of the digital document is determined. The digital document is processed based on the language to form a first document. Next, word groups are gathered from the first document based on a gathering range and apart-of-speech, wherein each word group includes the keyword and a word with the part-of-speech.