We have constructed a web-based framework for collaborative multilingual grammar and treebank development in which developers are distributed around the world. It is important for developers of the world-wide collaboration to i) grasp and share the big picture of the grammar and treebank of each language and ii) understand commonalities of languages. Our framework, the Lextype DB, describes lexical types of the grammar and treebank. Lexical types can be seen as detailed parts-of-speech and are the essence for the two important points just mentioned. Information about a lexical type that the Lextype DB provides includes its linguistic characteristics; examples of usage from a treebank; the way it is implemented in a grammar; and correspondences to major computational dictionaries. It consists of a database management system and a web-based interface, and is constructed semiautomatically. Currently, we have applied the Lextype DB to grammars and treebanks of Japanese and English.