Press ads, created by BDH\TBWA, highlight that spend in the regional press has reached £3 billion, with more national advertisers committing to the medium.
The ads follow a review of NS marketing activity to bring it closer to the work of sales teams that sell regional newspapers to national advertisers.
They will run in trade and regional press titles from this week. Media planning and buying is through Media-edge:cia Manchester.
The NS is also putting a greater focus on targeting strategic planners and client companies in a bid to influence the planning process.
The new drive is being led by the NS marketing committee, chaired by Kevin Beatty, the managing director of Northcliffe Newspapers.
The NS has also begun a search for a marketing director following the departure of Russell Collier earlier this year.