In response to @gene I type
d.mon in command line, getting a popout GUI look like this:
I choose the top three flags(-l, -L, -p), and I got this:
And I don't know what to type in 4 blanks below:
Then I close GUI window, typing command
d.mon start=x0, and got this:
As I type command
d.rast hc(I have a raster file named hc and I want to display it), I got this：
and except this I got nothing and the map is not displayed.
How can I do to make the display succeed？
I am using GRASS 6.4.3 under windows 8.1 64-bits.