Overview of the ntcir-14 we want web task

In this paper, we provide an overview of the NTCIR-14 We Want Web-2 (WWW-2) task, which includes the Chinese and the English subtasks. The series of WWW tasks are classical ad-hoc textual retrieval tasks. The WWW-2 task received 10 runs from 2 teams for the Chinese subtask, and 18 runs from 4 teams for the English subtask. In this overview paper, we not only describe the task details, data and evaluation methods, but also show the report on the official results.