A unified communications (UC)-based video conference call method and system, and a device, where receiving, by a first UC client, a request for querying call information of a second video conference terminal (VCT), where the request includes an identifier of a called contact; sending the query request to a UC server, and receiving the call information of the second VCT; and sending, by the first UC client, the call information of the second VCT to a first VCT, hence the first VCT initiates a video conference call to the second VCT according to the call information of the second VCT. By integrating a personal computer (PC)-based UC system with a hardware video conference system that is based on a digital signal processor (DSP) and embedded software, a high-quality video conference can be initiated and held using a UC client, thereby boosting user experience and enhancing product competitiveness.