my friend gave me Arduino mega 2560 (At16) board' he used it as midi device but now i want use as program board.'
to reset Arduino mega 2560 i trying to upload bootloader using Arduino uno as isp programmer but after complete upload board still showing as midi device.
As far as I know that means that somebody (you?) programmed the TTL-to-USB converter to provide a different functionality.
From your image, I think that you're trying to reprogram the 2560 to solve it (but I might be wrong); you need to reprogram the TTL-to-USB converter with the correct firmware.