1. A system for recommending a thesaurus in an input method, comprising: a thesaurus set unit and a thesaurus selecting unit which are located on a network side, and a terminal which is currently used by a user and located on a terminal side; wherein the thesaurus set unit is configured to store multiple different thesauruses; the thesaurus selecting unit is configured to obtain personal information of the user through the Internet from the terminal currently used by the user, determine one or more thesauruses which match the personal information of the user from the thesaurus set unit, and send the determined thesauruses to the terminal currently used by the user so that the thesauruses are available for being installed on the terminal currently used by the user; and the terminal currently used by the user is configured to store the personal information of the user, and install the thesauruses sent from the thesaurus selecting unit.