1. A method for supporting a creation of a dictionary for a translation system which translates a first language into a second language, comprising the steps of: entering a first language document and a corresponding second language document; extracting each first language character string to be registered in the dictionary from the first language document entered at the entering step; selectively extracting each corresponding second language character string with respect to each first language character string from the corresponding second language document according to a level of correspondence between a section of the first language document from which each first language character string is extracted and a section of the corresponding second language document to which each corresponding second language character string belongs, by morphologically and syntactically analyzing the first language document and the second language document; and selectively outputting each first language character string extracted at the extracting step along with each corresponding second language character string extracted at the selectively extracting step as a candidate for a registration knowledge to be registered in the dictionary according to the level of correspondence.