In this article, policy advertising has been generalized into 3 types in accordance with the concept of the policy. Moreover, policy advertising functions have been formed in regards with the 5 phase policy formation process. Therefore, the following roles that can be accomplished by policy advertising in the policy formation process have been examined: composition of public opinion when a policy is re-established, minimizing elements of policy misinterpretation when a policy is established, raising recognition of the policy in the policy enforcement stage, inducing comprehension and support in the policy enforcement stage, revision in the conclusion stage. Per analysis, the subject of policy advertising has changed from after establishment of the civil government, abstract policies such as a nation’s competitive power to the recent detailed policy. Also, policy advertising has changed in accordance with its type, from past realization of movement directed policy advertising to present increments in policy advertising in the legislation process. Additionally, in the policy formation stage, if the phase policy advertising played a role was abstract, general, and limited by the policy re-establishment stage, such changes in roles can been clarified and therefore indicates the role of policy advertising