A method includes generating first virtual space data for defining a first virtual space. The first virtual space includes a first avatar associated with a first user terminal; and a first virtual room including the first avatar and a first virtual screen. The method includes detecting a movement of a head mounted device (HMD) included in the first user terminal. The method includes identifying a visual field in accordance with the detected movement of the HMD. The method includes displaying, on the HMD, a visual-field image corresponding to the visual field. The method includes receiving, from a second user terminal, a visiting request signal requesting that a second avatar associated with the second user terminal visit the first virtual room. The method includes updating the first virtual space data by updating a size of the first virtual screen based on a number of avatars arranged in the first virtual room.