What model devices? Assuming these are Network Attached Storage devices they have to be connected via the network. How is your PC connected to the internet?
I'm going to make several assumptions, let me know if these are wrong:
1) The PC is connected to the internet via wireless network.
2) Your wireless router is provided by your service provided and functions as both a wireless router and the internet access device.
3) This router also has 3-5 Ethernet ports.
4) The Buffalo devices are both NAS devices.
If these are all correct, simply connect both Buffalo NAS devices to the wireless router directly. They will then be accessible by any computer connected to the network.
