A rotating inner member is used to drive operation of a retrieval tool connected to a dual-member drill string. The apparatus includes mobile communication terminal-side terminals, transmission and reception terminals, a connection detection unit, a switching unit, and a control unit. In addition, it is possible to synchronize the reproduction start timing of a music reproduction unit corresponding to one measure being reproduced by a first track with the reproduction start timing of a music reproduction unit corresponding to plural measures being reproduced by a second track. Each insert is located in a separate and sealed cavity in the carrier. When the register setting data indicates \u201c0\u201d, the output signals from both the first and the second latch circuits become \u201c0\u201d, and until being reset, the write error protect state is maintained.