1. An image generating apparatus, comprising: a memory storing avatar data, the avatar data including a plurality of data sets and each of the data sets represents a motion of an avatar in a virtual space; and a processor coupled to the memory and the processor configured to: obtain sensor information that represents a motion of a person in a real space acquired from at least one sensor; determine a first value that indicates an impression of the person based on the obtained sensor information; determine a type of the motion based on the obtained sensor information; select at least one candidate data set corresponding to the type of the motion from the memory; determine a second value that indicates impression of the avatar for each of the selected at least one data set; select a representative data set based on the determined first value and the determined second value; and generate an avatar image based on the representative data set.