Meanwhile, in
However, for example, for users such as the user B other than the user A having performed the merge manipulation, the structure of the object 166 is difficult to understand from just seeing the object 166 as illustrated in
In other words, it is not possible for the users such as the user B having not performed the merge manipulation to easily understand how the objects 164 and 165 are merged to obtain the object 166.
Hence, it is desirable that the objects 164 and 165 forming the object 166 in
In other words, for example, in the object 166, the object 164 and the object 165 are displayed in such a manner as to be discriminated from each other by using different colors. Thereby, the structure of the object 166 can be easily understood.
Alternatively, the object 166 generated from the objects 164 and 165 may be displayed, for example, as illustrated in