Bunyan, formerly director of portal management at Virgin Media, takes up the role of digital director for Trinity Mirror Regionals at the end of the month.
He will report to Georgina Harvey, managing director of Trinity Mirror's regional division, and David Black, group director of digital publishing.
Harvey said the appointment would contribute "significantly" to Trinity's goal of expanding the group's digital presence in the regions.
Following a successful experiment in Teesside, Trinity is launching two further "hyperlocal" websites - typically covering a single postcode - in Coventry next month and in other parts of the UK later this year.
Trinity launched its hyperlocal initiative last April and now has sites covering all 23 "TS" postcode areas in the distribution area for its Teesside Evening Gazette title.
Last June, the group began a major upgrade of its regional websites, starting with the Liverpool Echo and the Liverpool Daily Post, followed by the Birmingham Mail and Birmingham Post in January and February respectively.
Most recently, it relaunched the Coventry Telegraph website, introducing a new nostalgia section with old pictures from readers and its own archive, which dates back 110 years.
In its end-of-year results, published in February, Trinity said it expected ad revenues for January and February to be down 3% year on year. On a regional level, it said ad revenues fell by 4% in January, but by only 2% in February.
Its 2007 digital ad revenues, however, which now account for 3.7% of the group's total revenue and 6.7% of its total advertising revenue, rose by 35.6% to £34.3m.