What is this weird plug?
It looks like an NF C 61-315 standard French single phase plug:



These are are rated for 400V, 32A on a single phase. The socket you have pictured looks like a French style Schuko (CEE 7/3), which is typically only rated to around 16A. My guess is that unless you already have a socket that was intended for use with an electric stove, the wires are likely not a suitable gauge to handle the current demand.  

If you have an outlet with the appropriate wire gauge, it would probably just be a matter of replacing either the outlet or the plug.  If you have any doubts, I'd consult an electrician before attempting to connect it.

Image credit: "Power connector Legrand 32A" by Kae - Own work. Licensed under CC BY-SA 3.0 via Commons - https://commons.wikimedia.org/wiki/File:Power_connector_Legrand_32A.jpg#/media/File:Power_connector_Legrand_32A.jpg