Thessaloniki electronic crimes squad police traced the man's IP address and found that he was using a specialised internet child pornography file sharing programme.
A search of his residence on Corfu, conducted in cooperation with the local security police, turned up 7 hard disc drives with more than 250 files containing photographs and videos of children and adolescents in sexual acts.
The 52-year-old will be led before a local prosecutor.
The case was uncovered just 24 hours after the arrest of a 35-year-old man in Thessaloniki who had more than 30,000 files of hard-core child pornography material in his PC.
The Thessaloniki case is the biggest with respect to the material seized that has been uncovered by authorities in northern Greece involving a single perpetrator.
The two arrests were made in the process of ongoing investigations by Thessaloniki electronic crimes squad police.