Abstract: The present invention provides an educational data processing device to reutilize the answer data to a certain question as incorrect answer data for other questions and it also provides a data processing device to store data, question and answer with ease. The educational data processing device of the present invention comprises a computer with a CPU, a memory system, and input and output systems; a DSG, stored in said memory system consisting of multiple DS where each DS consists of two types of data, a question and answer; and a program, stored in said memory system that performs the following functions: (a) selects a question and answer data from a DS, and one or more answer data from randomly selected DS in said DSG; (b) presents a question and Multiple-choice answer set to the user through said output system.