ABSTRACT -- Nowadays, there are a small number of Computer-Aided Instruction (CAI) software in Thailand. Besides, most software was developed for specific purposes. The Encyclopedia Building software is a CAI, which can be created by the users themselves. Users can define key words, contents, and images used to illustrate the contents so that the students can use them as a referenced encyclopedia. User, moreover, can also define secondary key words appeared in any contents of the primary key words.