This study aimed to identify the language style based on diction that is employed by CNN Indonesia in their advertorial article. The writer analyzed the two advertorial articles that were taken from the national and lifestyle sections. The writer analyzed the language styles using three indicators from Keraf's language style theory (2006): vocabulary, sentence length, and sentence structure. Additionally, the study was supported by other supporting theories, which were the theories of syntax, inversion, and sentences. The study was conducted using the qualitative method. The study revealed that CNN Indonesia employed all three diction-based language styles in their national and lifestyle advertorial articles. The national advertorial article mostly used the formal language style, while the lifestyle advertorial article mostly used the informal and conversational language style. Moreover, the findings showed that there are some similarities and differences in the language styles used by both advertorial articles. Some indicators that indicate the employment of a language style might be very prominent in one section and not in another section. The employment of language styles based on diction in the chosen advertorial articles was influenced by its topic and targeted audience.