1. A system for detecting related topics and competition topics for a target topic, the system comprising: at least one computer hardware to implement: an extractor configured to create topic templates and association words from documents created online to generate topic templates and association words; and a detector configured to detect and trace related topics and competition topics for the target topic based on the topic templates for the target topic, the topic templates for the competition topics, and the association words, wherein the competition topics are topics which compete with the target topic, wherein the related topics are displayed depending on time and importance, and wherein the related topics are topics that become issues among the association words of the target topic and ranked according to a degree of becoming issues.