Catalysis of the reaction: m+1 alpha-D-glucopyranoside + n+1 alpha-D-glucopyranoside = m alpha-D-glucopyranoside + n+1 beta-D-fructofuranosyl-(2->6)-alpha-D-glucopyranoside (m > 0; n >= 0).
1F-oligosucrose 6G-beta-D-fructotransferase activity