Visitors are responsible for his/her VISA and passport applications needed to enter Taiwan.
Go here for the list of countries with VISA EXEMPT entry.
Please contact your travel agent or local consular, or visit Bureau of Consular Affairs, Ministry of Foreign Affairs, Republic of China (TAIWAN).
Visitors from mainland China will need an official invitation letter, which will be provided by your counterparts. Process time for VISA application in this case is estimated to be 3 ~ 4 weeks for an individual and 1.5 ~ 2.5 months for a group.