Note that
For example, the plurality of users write text formed by the text objects 321 to 323 as illustrated in
In other words, when, for example, the user A on behalf of the other users performs selection manipulation of the objects 321 to 323 in his/her desired order, the selecting order is desirably checked in the user's own view 41a of each user.
Thus, when, for example, the user A performs selection manipulation of the objects 321 and 322 in this order, the objects 321 and 322 as illustrated in
In other words, the user's own view 41a of, for example, the user A displays that the front-end display 341 provided with the front end of the thread-shaped line 342 passes through the object 321 and then the object 322.
The user's own view 41a of the user A displays, in a discriminatory manner, the objects 321 and 322 having been selected by the user A and the object 323 not having been selected.