Any speech behavior reflects personal characteristics of the speakers. In speech, communicants actualize their individual, social, national, and cultural characteristics, which are in an inseparable unity and represent a specific linguistic behavior. However, the authors note that the features of the actualization of these characteristics and their combination change, which depends on the communication situation and on a particular speech genre. The main approach of the research is the synchronouspersonal approach. The authors examined and analyzed examples of the speech behavior of a particular prosecutor. They studied his speeches in a jury, in a professional court, and a newspaper article written by him. All speeches have similar features: 1) the same parameters of the personal, social and objective planes of the implicit speech strategy “Participation / Nonparticipation of members of communication in a speech event”, 2) almost similar indicators of certain / uncertain statements of the implicit speech strategy “Sure/Unsure speech behavior of an author” in the speech to professionals in the court and in the newspaper text. All three speeches have more negative attitudes to the speech event. The study distinguished significant differences. The indexes of all the planes in the speech before the jury differ in comparison with the speech before the professionals and in the newspaper article. The authors revealed a strict connection between the sender’s speech behavior and various targets of the addressee. Speech behavior also depends on the recipients of these texts. It has been proved that human speech behavior is not a static system, and it can change, which depends on communicants’ interaction.