The invention provides a mobile apparatus, adapted to communicate with a cloud server. The mobile apparatus includes a voice system, a communication module, and a processing unit. The processing unit is coupled to the communication module and the voice system. The communication module transmits the first voice signal to the cloud server. The cloud server parses the first voice signal to obtain a communication target and a communication instruction. The processing unit receives the communication target and searches an address book in the mobile apparatus according to the communication target for obtaining a selection list conforming with the communication target. When the voice system receives the second voice signal, the second voice signal and the selection list are transmitted to the cloud server simultaneously by the communication module for generating a selection target, and the processing unit receives and executes the communication instruction and the selection target.