A video conference method, applied to a video conference system in a multi-way conference is provided. The video conference method includes: retrieving a first number of a plurality of terminals of the multi-way conference; determining whether at least one other terminal is requiring to join in on the multi-way conference; when the at least one other terminal is requiring to join in on the multi-way conference, increasing the first number of the terminals of the multi-way conference to a second number of the terminals; and determining a resolution of the video signal captured and transmitted by the video conference system according to the second number of the terminals. A video conference system using the video conference method, is also provided.