§1. With respect to the universal Church, the function of proclaiming the gospel has been entrusted principally to the Roman Pontiff and the college of bishops.
§2. With respect to the particular church entrusted to him, an individual bishop, who is the moderator of the entire ministry of the word within it, exercises that function; sometimes several bishops fulfill this function jointly with respect to different churches at once, according to the norm of law.
Source: Code of Canon Law (Vatican.va)