1. A language processing system for translating an input statement of a selected source language into a lower-level machine-oriented language comprising: (a) input means for inputting an input statement written in the selected source language of a computer; (b) storage means for storing a first table for storing keywords of grammer of said selected source language and characteristics of the keywords and for storing characteristics of variables used in a program coded by said selected source language; a second table for storing information of control procedures for interpreting the input statement to translate the input statement into a lower-level machine-oriented language, said information being predetermined and based on syntax/grammer of the selected source language; (c) control means for controlling translation processing of an input statement written in the selected source language from said input means, said control means including searching means responsive to said input statement for searching said first table to obtain a location therein at which a desired keyword variable is stored and to obtain an attribute associated with said keyword variable; comparing means for comparing said attribute from said searching means with a corresponding attribute stored in said second table to check whether the syntax of the input statement meets the grammer of said selected souce language; and converting means responsive to a determination of a match between said attributes as a result of the comparison by said comparing means, for converting said input statement into a lower-level machine-oriented language based on a predtermined conversion rule.