I used 'Hyper Terminal' to receive the data and I also used 'Tera Term' program.... the problem is same.
and when I choose another code to check an interface between them or wiring or others, I found it again.
I don't know why...
...to be at a loss to do what to know.
In your opinion, Do you think a problem is?
and now I think I will try to buy a new arduino board only to check it, Is this a good decision?, because I have bluetooth module a lot and problem occurred in the same way.
... normal serial interface connect trough usb to pc is send data correctly. Thus in my thinking, the board may failure in bluetooth system.