The objective is hereby study is to compare the effects of conventional and audiovisual methods on learning efficiency and success of retention with regard to vocabulary teaching in foreign language. Research sample consists of 21 undergraduate and 7 graduate students studying at Department of French Language Teaching, Kazim Karabekir Faculty of Education, Ataturk University. The methodology applied herein is experimental research. Two groups of 14 were randomly established, one as experimental and one as control group. Experimental group underwent audiovisual method, while conventional vocabulary teaching method, still applied in schools, was applied on the control group. The data was gathered from instructive videos equipped with pedagogical references on the website of TV5 monde, under the title "Enseigner le français avec Tv 5 Monde" [Learn French with TV5 Monde]. Two practices, namely, "2001-2011: faut-il encore avoir peur du terrorisme" [2001-2011: Should we still fear terrorism?], "guerres et conflits: vers une privatisation générale?" [Wars & conflicts: Towards an overall privatisation?], both at C1 education level, have been selected. Success rates in research data were found out by means of percentage calculations. The resulting values are analysed and interpreted through descriptive and content analysis methodology. According to research outputs, the learners are more successful in efficiency of learning and retention via audiovisual method than through conventional method. Simultaneous action of multiple sense organs and high motivation during learning process are considered as the principal reasons for such success.