An integrated circuit has a functional circuit for achieving an actual operation function of the integrated circuit, and a redundant circuit that is used based on a changeover from a defective circuit within the functional circuit. A positioning device on the middle carrier has a portion that protrudes outside the casing and operates like a button. The sound encoder then outputs the multiplexed code including the acquired error correction code added to the end thereof as a sound code. When receiving the target data and the test data transmitted from the education support server, the user terminal displays the content of the test together with the target score the user should aim for, on a display section.