1. A computer-implemented method for performing multi-selection, comprising: opening and displaying an object group on a display device, the object group comprising at least one object; selecting according to a first selection instruction an object from the object group into a first group; selecting according to a second selection instruction an object from the object group into a second group, wherein the objects belonging only to the first group are symbolized by a first type of icon, the objects belonging only to a second group are symbolized by a second type of icon different from the first type of icon, and the objects belonging to both the first and the second groups are symbolized by both the first type of icon and the second type of icon; and performing, by a processor, a first operation on the objects belonging only to the first group, and a second operation on the objects belonging only to the second group, and both of the first and second operations on the objects belonging to both of the first and second group, upon completing both of the first and second selections, wherein the first operation is different from the second operation.