French President Francois Hollande has told the nation that the terrorist threat is still at its "highest level."

In his traditional New Year's Eve speech, Hollande said: "We just lived a terrible year."

That year included the January attacks against the satirical magazine Charlie Hebdo and a kosher supermarket to November 13 attacks that left 130 dead in Paris.

Hollande added: "The threat is still there ... We often thwart attacks".

The Socialist president called again on a constitution change to revoke citizenship of convicted terrorists born in France who have dual nationality.

Hollande said "2015 has been a year of suffering and resistance, let's make from 2016 a year of courage and hope."