As desribed by oviatt et al . (1997), when two or more modalities work together, the integration thecniques used for combining different modalities into a whole system is very iportant. The integrtion thecniques are the main determinants in guiding the design of the multimodal system. To resolve a map-based multimodal system,we propose to use natual language processing (NLP) to identify and desribe the syntax and the semantics of prepositions within the spoken speech, in particular, when it relates to map or dirrections. From the results, the preposition syntactic and the semantic behaviours will be used to integrate with the sketch. This intergartion technique is expected to produce a better solution in map-based multimodal system. One of the possible frameworks to be used is prepnet for processing the speech next.