An image sending apparatus includes a first authentication unit configured to perform processing for first authentication to authenticate a user, a storage unit configured to store authentication information used when the first authentication unit authenticates the user, a sending unit capable of sending image data by a plurality of kinds of sending methods, a destination setting unit configured to set a destination to which the sending unit sends the image data, a second authentication unit configured to perform processing for second authentication required for the sending unit to send the image data to the destination set by the destination setting unit, and a determination unit configured to determine whether to use the authentication information stored in the storage unit when the second authentication unit performs the processing for the second authentication, based on the sending method by which the sending unit sends the image data to the destination.