The invention relates to an antenna system and a control method for the antenna system. The antenna system comprises a control module, a master set high-frequency antenna, a master set medium and low-frequency antenna, a diversity high, medium and low-frequency antenna, a master set high-frequency antenna switch module, a master set medium and low-frequency antenna switch module, a diversity medium and low-frequency antenna switch module and an antenna selector switch, wherein the master set high-frequency antenna is connected with the master set high-frequency antenna switch module; the master set medium and low-frequency antenna and the diversity high, medium and low-frequency antenna are connected with the master set medium and low-frequency antenna switch module and the diversity medium and low-frequency antenna switch module through the antenna selector switch; the control module is configured to judge a frequency band in which a current network signal is located; and when the current network signal is in a high-frequency band, the antenna selector switch is controlled to be in an unswitched state. On one hand, the antenna system is relatively simple and compact in structure, and does not affect the use experience of a user; and on the other hand, the problem that the signal which is received and transmitted through the master set high-frequency antenna is affected by the signal which is received and transmitted through the diversity high, medium and low-frequency antenna in the high-frequency band is solved.