This study examined the influence and relationship between communicative gestures about language
development of 1-year-old infant and infant-teacher interaction. The subjects were 76 infants between 18
to 24 months old and 47 teachers, both from day-care centers located at J city, and G city in
Jeollabuk-do Province. Data was obtained through video analysis according to the process that proposed by
Wetherby and Prizant(2003), and was analyzed by APECP and MCDI-K. The results were as follows: first,
there was a positive correlation between infant’s communicative gestures, receptive language, and expressive
language. Second, there was a positive correlation between infant-teacher interaction, receptive language,
and expressive language. Third, as a result of examining the influence of infant’s communicative gestures
and teacher’s interaction on infant’s receptive language and expressive language, influence of expressive
gestures was the highest, followed by conventional gestures, which showed that expressive gesture was the
most influential for receptive language and expressive language. That is, infant's communicative gestures
were the most influential to infant's language development rather than infant-teacher interaction, which
indicates that the factor that most effectively predicts infant’s language development is infant’s
communicative gesture. The result of this study may be a useful data for teachers or parents, in finding
methods for infant’s communication ability.