In this study, user-oriented green space experienced by residents was defined as perceived green space, and the number of people in the service area and the accessibility from residence to green space were analyzed in a more practical way. For this purpose, perceived green spaces were classified and selected into forest, park, and facility green spaces. Using QGIS, network analysis was conducted with the investigation area set as the census tract, which is the minimum unit. Using the QNEAT3 algorithm in QGIS, an analysis of service areas and accessibility between perceived green spaces and census tracts was applied to the 16 districts and counties of Busan Metropolitan City. The results showed that the ratio of population within a 10-minute walking service area from perceived green spaces was highest in Buk-gu, Suyeong-gu, Gijang-gun, and Dongnae-gu, in that order. Similar results were also obtained in the accessibility analysis. This study aims to supplement existing methods for assessing green space inequality by understanding the status of green spaces from the perspective of residents' perceptions and demands. It is expected that by strategically locating parks and green spaces in more appropriate areas, the satisfaction of urban residents with green space utilization will be increased in the future.