Please be aware that the Roku Community only supports the English language and we had to use Google Translate to understand your post.
Can you please provide us more information about the issue you are experiencing? What Roku model device are you using? If you have a Roku Express or Premiere model, have you ensured your router is broadcasting a 2.4GHz Wi-Fi network for the device to connect to? The Roku Express/Premiere is only compatible with wireless b/g/n networks on the 2.4 GHz spectrum.
With more detailed information, we will be able to assist you further.