Multi-connectivity communication method and apparatus

A data transmission apparatus, wherein the apparatus comprises one or more processors to run instructions cause the apparatus to:

• determine a first secondary node and a second secondary node;
• send first information to the first secondary node, wherein the first information is used by the first secondary node to select a first frequency band, and the first information comprises a first index;
• and
• send second information to the second secondary node, wherein the second information is used by the second secondary node to select a second frequency band, and the second information comprises the first index, wherein
• the first index indicates a first frequency band combination supported by a terminal device, and the first frequency band and the second frequency band are in the first frequency band combination.

A non-transitory computer readable medium storing instructions that are executable by a computer, the non-transitory computer readable medium is applied to a first communication apparatus, and the instructions comprise instructions for:

• determining a first secondary node and a second secondary node;
• sending first information to the first secondary node, wherein the first information is used by the first secondary node to select a first frequency band, and the first information comprises a first index;
• and
• sending second information to the second secondary node, wherein the second information is used by the second secondary node to select a second frequency band, and the second information comprises the first index, wherein
• the first index indicates a first frequency band combination supported by a terminal device, and the first frequency band and the second frequency band are in the first frequency band combination.