Abstract: A system is provided for inputting of a portion of a word or problem on a specific page of a book for assisting the reader of the book in understanding the term as it is being used in the book. An interchangeable memory is inserted into the system corresponding to the book which is being read. An interchangeable or permanent system memory is further provided for storing commonly used words or problems with respect to the subject matter of the book therein. The system operates by inputting a page number and a portion of a word or problem in the book into the system, and the system matches this portion on the specific page with a word or problem in its memories. The word and definition may then be output by the system so that the reader understands the word or problem as it is being used. In addition, alternate definitions of the word or similar problems to the problem which is output may be provided to the reader for further aid in comprehension.