The purpose of the study was to investigate the competency and need of elementary school in-service teachers with regard to the integration of information into instruction. The participants in this study were 387 elementary school in-service teachers from different areas of Taipei. The study was investigated by using a questionnaire developed by the researcher. Data was analyzed by using statistical methods including EFA and Pearson correlation. The major findings are presented in the following way: (1) There are seven facets consisting of competency for elementary school in-service teachers regarding information technology integration. (2) The priority needs for in-service teachers regarding information technology integrated into instruction are "Concepts of information technology literacy", "Needs analysis for instruction", "Plan for instructional activities", "Instructional resources development", "Facilitating for instructional activities", "Teaching evaluation", and "Teaching professional development". Suggestions are also provided in the article.