In this paper, we present an ontology-based visualization language learning support system (VLLSS) which provide learning materials based on topic maps. A pilot experiment was conducted to study the learning behaviors features of learners who studied with VLLSS. One class of 11 intermediates and one class of 19 beginners from a university in Taiwan studied with the system for learning Japanese grammar. Not only the reported learning perception but also the learning logs recorded by VLLSS are analyzed. In terms of learning perception, no significant difference was found in other scales except in a tendency of significant difference in mental load. It is found that compared to intermediates who studied more difficult grammar points, the beginners reported significant higher pressure when studied with the system. In terms of learning logs, we analyzed the ratio of studied related grammar points to the target grammar points, the ratio of studied relations to the target ones, and the number of the target grammar points. We also studied the relation between those three parameters and the learning habit.