A terminal comprising: • a first baseband processor, a second baseband processor, a first radio frequency chip, a second radio frequency chip, a first antenna, a second antenna, a third antenna, and a fourth antenna, • wherein the first baseband processor is connected to a first card slot, the second baseband processor is connected to a second card slot, the first baseband processor, the second baseband processor, the first radio frequency chip, and the second radio frequency chip all support an access capability of a third-generation or later-generation mobile communications technology; • the first baseband processor is connected to the first antenna by using the first radio frequency chip, and the first radio frequency chip is connected to the first antenna to form a first channel; • the first baseband processor is connected to the second antenna by using the first radio frequency chip, and the first radio frequency chip is connected to the second antenna to form a second channel; • the second baseband processor is connected to the third antenna by using the second radio frequency chip, and the second radio frequency chip is connected to the third antenna to form a third channel; and • the second baseband processor is connected to the fourth antenna by using the second radio frequency chip, and the second radio frequency chip is connected to the fourth antenna to form a fourth channel, wherein • the first channel, the second channel, the third channel, and the fourth channel are configured to transmit data between the terminal and an external device, wherein the first baseband processor is connected to the second radio frequency chip by using a switch of the terminal, and the first baseband processor is further configured to: when the first baseband processor transmits data by using the first channel, the first baseband processor transmits the data by using the first channel and the third channel if the third channel is idle. • a first baseband processor, a second baseband processor, a first radio frequency chip, a second radio frequency chip, a first antenna, a second antenna, a third antenna, and a fourth antenna, • wherein the first baseband processor is connected to a first card slot, the second baseband processor is connected to a second card slot, the first baseband processor, the second baseband processor, the first radio frequency chip, and the second radio frequency chip all support an access capability of a third-generation or later-generation mobile communications technology; • the first baseband processor is connected to the first antenna by using the first radio frequency chip, and the first radio frequency chip is connected to the first antenna to form a first channel; • the first baseband processor is connected to the second antenna by using the first radio frequency chip, and the first radio frequency chip is connected to the second antenna to form a second channel; • the second baseband processor is connected to the third antenna by using the second radio frequency chip, and the second radio frequency chip is connected to the third antenna to form a third channel; and • the second baseband processor is connected to the fourth antenna by using the second radio frequency chip, and the second radio frequency chip is connected to the fourth antenna to form a fourth channel, wherein • the first channel, the second channel, the third channel, and the fourth channel are configured to transmit data between the terminal and an external device,