should I find a Travel agency

Im holding a Vietnamese passport studying BBA in Taiwan, and Im participating in a short-term summer program to Chiba, Japan in July. I wanna visit Macau after the trip, so Japan is the only way I can get my visa (in spite of Taiwan's disputed government problem with PRC, we don't have a Chinese consular here in Taiwan, and I cant get to either Hong kong or Macau without a pre-arranged visa) I see that the 2nd notice says I have to apply to a travel agency, what do you mean by a travel agency and how can I find one in Japan (Tokyo) ?