1. An image processing apparatus connectable to a network, comprising: a storage unit configured to store first address book information indicating transmission destination of data which is to be transmitted outside the image processing apparatus and first set information for operating the image processing apparatus; a receiving unit configured to receive, from an external apparatus via the network, second address book information indicating transmission destination of data which is to be transmitted outside the image processing apparatus and second set information; a setting unit configured to set a first setting as to whether or not to update the first address book information and a second setting as to whether or not to update the first set information; and an updating unit configured to, in a case where the first setting indicating update of the first address book information is set by the setting unit, update the first address book information stored in the storage unit with the second address book information received by the receiving unit, and in a case where the first setting indicating no update of the first address book information is set by the setting unit, not update the first address book information stored in the storage unit with the second address book information received by the receiving unit, and to, in a case where the second setting indicating update of the first set information is set by the setting unit, update the first set information stored in the storage unit with the second set information received by the receiving unit, and in a case where the second setting indicating no update of the first set information is set by the setting unit, not update the first set information stored in the storage unit with the second set information received by the receiving unit.