The invention relates to a mobile terminal address book updating method, which belongs to the field of wireless communication. The method comprises steps: address book information and a terminal identifier sent by a mobile terminal and a computer are received, wherein the address book information comprises at least one telephone number and the storage time of each telephone number; the information change time of the at least one telephone number is determined; according to the storage time and the information change time of the at least one telephone number, to-be-sent updating data are determined, wherein the updating data are used for updating the address book of the mobile terminal corresponding to the terminal identifier; and the updating data are sent to the mobile terminal. Through comparing the storage time of the telephone number and the information change time of the telephone number stored in a customer service database, an invalid number with information of a contact and information of an actual contact inconsistent is determined, the invalid number in the address book is deleted, the problem that the matching rate of information between the contact and the telephone number is low can be solved, and effects of improving the information matching rate between the contact on the address book and the telephone number are achieved.