The research objective is to determine inference of verbal communication based on context analysis and communication event context in public service advertisement. The focus of the research is the inference using context analysis with some categories as follow, personal intepretation, locational intepretation, temporal intepretation, and analogical intepretation. This research also refers to communication event context which consists of setting and scene, participant, ends, act sequence, keys, instrument, norms, and genres. The object of the research is 50 public service advertisements consisting of 485 word pairs. The methodology implemented in this research is qualitative with content analysis method. The result of analysis based on intepretational context shows that 830 intepretations were identified in 485 word pairs which mostly contains personal intepretation of 49%, analogical intepretation of 35%, 9% is the locational intepretation, and 7% temporal intepretation. Based on communication event in the advertisement, it is noticed that the process of message delivery is mostly in the form of elocution of 42% with presuasive message of 68% and comprehension communication reaches 56%. In terms of communication style, casual communication is 38%, while open communication is 66%. Based on data analysis, 9% of the advertisement uses female character as a communicator with local residential as background of 28% and day time setting of 66%. Most of the communication atmosphere used (38%) is easy situation. Based on overall context analysis, most of public service advertisement (64%) sponsored by state institution contain persuasive context (public information, government program or services).