Terminal, server, file storage system and file storage method

The invention provides a terminal. The terminal comprises a transmitting unit, a terminal side storage unit, a terminal side type determining unit, a terminal side judging unit and a terminal side processing unit. The transmitting unit is used for transmitting a request for acquiring file information. The terminal side storage unit is used for receiving the file information transmitted by a server and extracting and storing a list of types of files which are prohibited from being uploaded, and the format feature information of files of various types. The terminal side type determining unit is used for reading the content of the uploaded file when the uploaded file is received, and comparing the content of the upload file with the feature information of the files of the various types so as to determine the file type of the upload file. The terminal side judging unit is used for reading the stored the list of the types of the files which are prohibited from being uploaded, and judging whether the file type of t