To provide a supporting device allowing a student to learn while confirming his learning arrival level during' its operation (during learning).

When a retrieval key is inputted from an input section 30, the inputted retrieval key is stored in a retrieval completion key storage section 50. A retrieval section 40 stores the key, which is stored in an input target key storage section 20 storing the retrieval key inputted by a teacher in advance but is not stored in the retrieval completion key storage section 50, in a compared result storage section 60. An arrival level investigation section 70 calculates the learning arrival level from the stored contents of the compared result storage section 60 and the input target key storage section 20, outputs it to a display controller 80, and displays it on a display section 90.